How easy is 8 times {3 / 8 + 1 / 27} + 19 / 27

How easy is 8 times {3 / 8 + 1 / 27} + 19 / 27

=8×3/8+8×1/27+19/27
=3+（8/27+19/27）
=3+1
=4

16 / 23 · 27 + 16 · 19 / 23 (? Stands for multiplication sign) should be simple!

16/23×27+16×19/23
=16/23×27+19×16/23
=16/23×（27+19）
=16/23×46
=16×2
=32

Simple method 19.88 + 9.9 * 198.8

=19.88+99×19.88
=（99+1）×19.88
=1988
,

19.88 + 9.9 * 198.8 (simple calculation)

19.88+9.9*198.8
=19.88+9.9*(19.88*10)
=19.88+19.88*(9.9*10)
=19.88+198.88*99
=19.88*(1+99)
=19.88*100
=1988

People's education press fifth grade first volume Chinese final examination paper composition

I think that's the answer
Read more than ten thousand books, write more than ten thousand words
Being a stranger in a foreign land alone, I miss my relatives at every festival
April showers bring May flowers
The five ridges meander, the waves soar, and the Wumeng walk through the mud
name
Noisy
one disaster after another
go with head high and chest out
resolute and decisive

A national currency of 1 yuan, 5 yuan, 3 yuan, 7 yuan and 9 yuan can form 1 yuan, 2 yuan How many pieces of money do you need to prepare at least for the whole amount of 100 yuan?
Come on, in 30 minutes,

1 and 9 can make up 10, 3 and 7 can make up 10, and two 5 can make up 10, all of which make up the whole. 10 such 10 can make up 100. I don't know if that's the meaning. It's better to make the topic clear,

The composition of writing letters in English is about 40 words

Dear Alice Green ,
Hello!That you want to come to China travel news I am glad,I wish you happy that China can play!Us that China is a long history of civilization,the Great Wall is very good,majestic Great Wall,steep,scenic picturesque,welcome friends from all over the world come to visit tourist.I like to learn English,hoping to become friends of .
your friend Han Mei
I'm also a freshman. I wrote it myself. I don't know if I can!

Mother went to the store and bought 36 pieces of four kinds of goods, which cost 100 yuan. The unit prices of the four kinds of goods are 1 yuan, 2 yuan, 3 yuan and 5 yuan respectively. The known unit prices are 1 yuan and 2 yuan
Five yuan is the same number of pieces, and the unit price is two yuan and three yuan are the same number of pieces. How many pieces of each of the four items have been bought? Two kinds of calculation with the substitution method, within two hours, urgent!

1、 Let 1 yuan buy x pieces, 2 yuan buy y pieces, then 3 yuan buy y pieces, 5 yuan buy x pieces, 2x + 2Y = 36, get x = 18-y (1) x + 5x + 2Y + 3Y = 100. Get, 6x + 5Y = 100 (2) take 1 into 2, get, x = 10, so y = 8

A simple method of 10 / 3 * [25 + 1]

Original formula = 10 / 3 * 26 = 260 / 3

Xiaoming costs 1 or 8 yuan to buy two pencils and three erasers, while Xiaomei costs 2 yuan to buy the same four pencils and two erasers. How much is each eraser?

Let the pencil be x and the eraser be y
2X+3Y=1.8(1)
4X+2Y=2(2)
(1)*2-(2)=4Y=1.6
Y=0.4
So rubber is 40 cents