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When Xiao Jun reads a story book, the ratio of the number of pages he has read to the number of pages left is 2:3. Xiao Hui, a good friend of Xiao Jun, finds that the number of pages Xiao Jun has read is 28 pages less than three-quarters of the total pages of the story book. How many pages does the story book have?
Dear landlord
[positive solution]
Let the book have X pages by equation
3/4X--28=2/5X
3/4=2/5X+28
7/20X=28
X = 80 can also be used arithmetically
When Xiaojun read a story book, the ratio of what he had read to the number of pages left was 2:3. Then Xiaojun read 2 / 5 of the story book, and the number of pages left was 3 / 5
28 / (3 / 4-2 / 5) = 80 pages
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When Xiao Jun reads a story book, the ratio of the number of pages he has read to the number of pages left is 2 to 3. Xiao Hui, a good friend of Xiao Jun, finds that the number of pages Xiao Jun has read is 28 pages less than 3 / 4 of the total number of pages in the story book. How many pages is the story book?
Look at 2 / 5
28/(3/4-2/5)
=28/(7/20)
=80 pages
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Which is followed by a countable noun, which is followed by an uncountable noun, some or any
Any, any + singular countable noun
In addition, some is used in affirmative sentences and any is used in negative sentences and interrogative sentences
As shown in the figure, ⊿ ABC is inscribed in ⊙ o, ∠ B = 90 °, ab = BC, D is the point on ⊙ o which is centrosymmetric to point B about the center O, P is a point on the edge of BC, connecting AD and D
It is known that ab = 8, CP = 2, q is a moving point on the line AP, connecting BQ and extending one side of the intersection quadrilateral ABCD to R, and AP = BR, then the value of Bq / QR is?
Without graph, there are two results
(explain words and phrases and explain usage)
Use up; run out; tidy up oneself; take one's time; turn up; pick up; take up; fade away; pass out; go out; any way; somehow; anyhow; take on; mark out; take in; be fed up with; be taught up with; be put up with; (if you can help.)
Use up use up eg: who has used up all the paper? Run out finish sth run out eg: time is running out.tidy Pick up pick up pick up pick up pick up pick up pick up pick up pick up someone
Known: as shown in the figure, C is the midpoint of AB, ad is parallel to CE, ad is equal to CE
Because ad is parallel to CE
The angle DAC = angle ECB is obtained
Because C is the midpoint of ab
We get AC = BC
And ad is equal to CE
Edge, corner, edge
obtain
Triangle ADC is equal to triangle CEB
What are the plural forms of British and French?
The plural is the same as the singular
French
the French
a Frenchman
two Frenchmen
Britisher
the English
an Englishman
two Englishmen
In the acute triangle ABC, BC = 6, the area of the triangle ABC is equal to 12, the two moving points m and N slide on the sides AB and AC respectively, and Mn is parallel to BC. Take Mn as the side and make a square mpqn downward. Let the side length be x, and the area of the common part of the square mpqn and the triangle ABC be y (y)
Let a be a and nd be Z. the area of common part is y = x · Z (1) the equation of AMN is similar to ABC: A / 4 = x / 6 (2) because Mn is parallel, BC can be listed: 4
Tom grows the nicest vegetables, fruits and the most beautiful
Tom grows the nicest vegetables and fruits and the most beautiful flowers in the village.Plants grow in Tom’s garden all through the __ 1__ and they are much __ 2__ . Tom cuts some flowers for his si...
It is known that the height of a right triangle is 3.9 m, and the hypotenuse is 7 M. how to calculate the area requires a formula,
Calculate another right angle side with Pythagorean: B ^ = C ^ - A ^ = radical (7) ^ -- (3.9) ^, about 5.8m
Triangle area: S = (AB) / 2 = (3.9 * 5.8) / 2 = 11.31m
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