Xiaohongjia painted her room in spring. She employed five workers and finished it in 10 days. She used 150 liters of certain paint at a cost of 4800 yuan and painted an area of 150m2. When she finally settled the payment, she had the following plans: Plan 1: 30 yuan for each worker; plan 2: 30% for each worker; plan 3: 30% for each worker According to the painting area, we pay 12 yuan per square meter. Please help xiaohongjia to choose______ It's the most economical (economical) to pay

Xiaohongjia painted her room in spring. She employed five workers and finished it in 10 days. She used 150 liters of certain paint at a cost of 4800 yuan and painted an area of 150m2. When she finally settled the payment, she had the following plans: Plan 1: 30 yuan for each worker; plan 2: 30% for each worker; plan 3: 30% for each worker According to the painting area, we pay 12 yuan per square meter. Please help xiaohongjia to choose______ It's the most economical (economical) to pay

The salary of the first scheme = 30 × 10 × 5 = 1500 (yuan); the salary of the second scheme = 4800 × 30% = 1440 (yuan); the salary of the third scheme = 150 × 12 = 1800 (yuan). Answer: the second scheme is the most economical

When a vegetable is sold after processing, the unit price can be increased by 30%, but the weight should be reduced by 15%. The existing 2000 kg of unprocessed vegetables are sold for 2652 yuan after processing, so the processed vegetables are sold more than unprocessed vegetables______ Yuan

Let's suppose that the price per kilogram before processing is x yuan. From the meaning of the question, we can get: (1 + 30%) x × (1-15%) × 2000 = 2652. The solution is x = 1.2.1.2 × 2000 = 2400 yuan, 2652-2400 = 252 yuan. So the answer is: 252

In the triangle ABC, if three sides are known to be continuous positive and even, the maximum angle is obtuse. (1) find the cosine of the maximum angle, (2) find the maximum angle as the internal angle

The maximum angle is an obtuse angle. It can be seen that the sum of squares of two shorter sides is less than the maximum side (cosine theorem). There are two groups of inequalities 2,4,6; 4,6,8. The former group does not satisfy that the sum of two sides is greater than the third side. Therefore, the length of triangle side is 4,6,8

The law of irregular change of verb past tense and past participle
In addition to the form ABC, there is also the rule of word change
Valid before 9:20, November 17

The past tense of regular verbs changes as follows:
In general, add - ed at the end of the verb
worked played wanted acted
End the verb with a silent - E and add - D at the end of the verb, e.g. live moved decided decided hopped judged raised wired
For verbs ending with the consonant + y, change - y to - I and then add - ed
Studied triple copied justified, crossed carried, embodied, empted, stressed closed syllable verbs ending with a consonant letter, double write the final consonant letter, and then add - ed, such as stopped begged, free drawn, dropped planned, dot driven
go - went make - made get - got buy - bought come - came fly-flew
Irregular change of past participle
AB type
can could shall should
will would may might
AAA type
cost cost cost
cut cut cut
hit hit hit
hurt hurt hurt
let let let
must must must
put put put
set set set
shut shut shut
read read read
AAB type
beat beat beaten
ABA type
become became become
come came come
run ran run
ABB type
bring brought brought
buy bought bought
think thought thought
catch caught caught
teach taught taught
build built built
lend lent lent
send sent sent
spend spent spent
dig dug dug
hang hung hung
feel felt felt
keep kept kept
sleep slept slept
sweep swept swept
leave left left
smell smelt smelt
spill spilt spilt
lay laid laid
pay paid paid
say said said
sell sold sold
tell told told
sit sat sat
spit spat spat
stand stood stood
understand understood understood
learn learnt learnt
mean meant meant
spoil spoilt spoilt
shine shone shone
win won won
have had had
make made made
hear heard heard
find found found
hold held held
ABC type
begin began begun
drink drank drunk
ring rang rung
sing sang sung
sink sank sunk
swim swam swum
blow blew blown
fly flew flown
grow grew grown
know knew known
throw threw thrown
draw drew drawn
show showed shown
break broke broken
choose chose chosen
forget forgot forgotten
freeze froze frozen
speak spoke spoken
wake woke woken
drive drove driven
eat ate eaten
fall fell fallen
give gave given
hide hid hidden
ride rode ridden
rise rose risen
take took taken
mistake mistook mistaken
write wrote written
am,is was been
are were been
do did done
go went gone
lie lay lain
see saw seen
wear wore worn
Error prone
show showed shown
draw drew drawn
fall fell fallen
feel felt felt
hold held held
help helped helped
think thought thought
thank thanked thanked
take took taken
talk talked talked
get got got
forget forgot forgotten
meet met met
mean meant meant
hit hit hit
hide hid hidden
ring rang rung
bring brought brought
eat ate eaten
beat beat beaten
lie lay lain
lay laid laid
find found found
found founded founded
buy bought bought
bring brought brought
learn learnt learnt
hear heard heard
Interviewer: Leo Songyou - Jinshi from grade 9 3-31 22:03
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The changing rules of past tense and past participle
There are two kinds of verb past tense and past participle: regular change and irregular change
1) Rule change
Pronunciation and explanation of case words
Past participle
Generally, add - ed look after the original verb
call
open
need looked
called
opened
needed looked [lukt]
called [kC:ld]
opened [5EupEnd]
Needed [Ni: did] ① - ed after clear consonant phoneme
It is pronounced as [t], after voiced consonants it is pronounced as [D], and after vowels it is pronounced as [D]
② - ed in [t], [D]
The last pronunciation is [ID]
③ But fix's past tense and past
The participle x is fixed
Verb ending in - E plus - d move
phone
hope
agree moved
phoned
hoped
agreed moved [mu:vd]
phoned [fEund]
hoped [hEupt]
agreed [E5^ri:d]
Verbs ending with a consonant and a Y, change y to I,
Plus - ed study
carry
try studied
studied
carried studied [5stQdid]
carried [5kArid]
tried [traid]
For words ending with the original letter plus y, add - ed play directly
enjoy
stay played
enjoyed
stayed played [pleid]
enjoyed [in5dVCid]
stayed [steid]
If there is only one consonant at the end of a stressed closed syllable word, double write the consonant and add - ed stop
plan
fit stopped
planned
fitted stopped [stCpt]
planned [plAnd]
fitted [5fitid]
For words ending with - R, double R,
Add - ed preference
refer preferred
referred preferred [prI`f:d]
referred [ri5fE:]
2) Irregular change
The past tense and past participle of some verbs in English vary irregularly, which can be divided into five situations
1. The original form, the past tense and the past participle are all in the same form
Example:
Past participle
Cut
Hit
Cast
Hurt
Put
Let
Shut (off)
Cost
Set
Rid cut
hit
cast
hurt
put
let
shut
cost
set
rid cut
hit
cast
hurt
put
let
shut
cost
set
rid
The past tense and the past participle are in the same form
Example:
Past participle
Find
Pay
Leave
Lend
Meet
Keep
Lose (lost)
Teach
Sit
Lead
Win find
paid
left
lent
met
kept
lost
taught
sat
led
won found
paid
left
lent
met
kept
lost
taught
sat
led
won
3. The original form of the verb is the same as the past participle
Example:
Past participle
Come
Run
Become a cam
ran
became come
run
become
4. The original form of verb, past tense and past participle are completely different
Example:
Past participle
Give
Fly
Drink
See
Go
Know
Wear
Speak gave
flew
drank
saw
went
knew
wore
spoke given
flown
drunk
seen
gone
known
worn
spoken
There are two forms of past tense and past participle
Example:
Past participle
Burn burned
burnt burned
burnt
Learn learned
learnt learned
learnt
Smilled
smelt smelled
smelt
Spell spelled
spelt spelled
spelt
Shined (irradiation)
shone shined
shone
Leap LED
leapt leaped
leapt
Tips
a. The past tense of be is in the same form as the original
Beat, beat, beat, beat, beat
b. Lie has two kinds: regular change and irregular change
By: lie lied, lied
Lay, lain
c. Hang has two kinds: regular change and irregular change
By: Hang hanged, hanged
Hang, hang
d. Welcome is a regular verb and should not be misused as an irregular verb
Ratio: welcome, welcome, welcome (positive)
Welcome, welcome
e. Don't mistake irregular verbs for regular ones
Ratio: hit, hit, hit
Hitted, hitted
Change rules of present participle
The present participle of regular verbs and its pronunciation
Generally, add - ing at the end of the original form of the verb, and the pronunciation of - ing is [in] go
push
play
carry going [5^EuiN]
pushing [5puFiN]
playing [pleiiN]
carrying [5kAriiN]
For verbs that end with a silent e, first remove E and then add - ing take
write
leave taking [5teikiN]
writing [5raitiN]
leaving [5li:viN]
Stress the verb at the end of the closed syllable. If there is only one consonant at the end of the word, double the consonant and add - ing cut
stop
fit
begin
forget cutting [5kQtiN]
stopping [5stCpiN]
fitting [5fitiN]
beginning [bi5^iniN]forgetting [fE5^etiN]
For verbs that end with ie, change ie to y and add - ing lie
die
tie lying [5laiiN]
dying [5daiiN]
tying [5taiiN]
If you want to read it like "together" and add the pronunciation D directly, you must be right
Here are some information, hope to help you
The changing rules of past tense and past participle
There are two kinds of verb past tense and past participle: regular change and irregular change
1) Rule change
Pronunciation and explanation of case words
Past participle
Generally, add - ed look after the original verb
call
open
need looked
called
opened
needed looked [lukt]
called [kC:ld]
opened [5EupEnd]
Needed [Ni: did] ① - ed after clear consonant phoneme
It is pronounced as [t], after voiced consonants it is pronounced as [D], and after vowels it is pronounced as [D]
② - ed in [t], [D]
The last pronunciation is [ID]
③ But fix's past tense and past
The participle x is fixed
Verb ending in - E plus - d move
phone
hope
agree moved
phoned
hoped
agreed moved [mu:vd]
phoned [fEund]
hoped [hEupt]
agreed [E5^ri:d]
Verbs ending with a consonant and a Y, change y to I,
Plus - ed study
carry
try studied
studied
carried studied [5stQdid]
carried [5kArid]
tried [traid]
For words ending with the original letter plus y, add - ed play directly
enjoy
stay played
enjoyed
stayed played [pleid]
enjoyed [in5dVCid]
stayed [steid]
If there is only one consonant at the end of a stressed closed syllable word, double write the consonant and add - ed stop
plan
fit stopped
planned
fitted stopped [stCpt]
planned [plAnd]
fitted [5fitid]
For words ending with - R, double R,
Add - ed preference
refer pref