A Chinese book is 12 pages more than a mathematics book. There are 141 pages in three Chinese books and four mathematics books. How many pages is a Chinese book?

A Chinese book is 12 pages more than a mathematics book. There are 141 pages in three Chinese books and four mathematics books. How many pages is a Chinese book?

Suppose: a Chinese book has x pages, and a mathematics book has (X-12) pages
3x+4(x-12)=141
x=27
So a Chinese book has 27 pages

Six identical mathematics books and three identical Chinese books are given to nine people, one for each. How many different ways are there?

Six mathematics books are regarded as group A, three Chinese books as group B, and nine people as nine different elements. They are put into two groups, six in group A and three in group B. as soon as the elements in group B are determined, group A will be determined. Therefore, three of the nine elements are divided into (9 * 8 * 7) / (3 * 2 * 1) = 84 methods

A student has 5 Chinese books and 3 English books. Now choose one for each student. There are several different ways to send them

5 × 4 × 3 = 60 species
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One half of the square

A quarter

A mathematical problem of permutation and combination
Choose four of the six people to visit Paris, London, Sydney and Moscow respectively. Each city is required to have one person to visit, and each person can only visit one city. If the first and second of the six people do not visit Paris, there are several different options

Four of the six people are selected to visit Paris, London, Sydney and Moscow respectively. Each city is required to have one person to visit, and each person can only visit one city. If a and B of the six people do not visit Paris, there are three different options: case 1: do not choose a and B to visit

A simple method is used to calculate 65 × 48 + 52 × 65 = ==

=65x(48+52)=65x100=6500

4x-2=3x+8

4x-2=3x+8
x=10

How much is 11 out of 18 + 8 out of 9 * 2 out of 3?

(11/18+8/9)*2/3*1/2
=(11/18+8/9)*1/3
=27/18*1/3
=9/18
=1/2

4x+3x =28

4x+3x=28
7x=28
x=28/7
x=4

Simply calculate the following questions. (1 / 3 + 1 / 4 + 1 / 6) △ 1 / 12 18 △ 7 / 6 + 6 × 1 / 7 + 16 / 7 △ 1 / 6 = = 6 / 5 △ 1 / 2-4 / 7 × 7 / 12) =

1、(1/3+1/4+1/6)÷1/12 ＝ (1/3+1/4+1/6)*12 ＝（1/3）*12+ （1/4）*12+ （1/6）*12=4+3+2=92、18÷7/6＋6×1/7＋16/7÷1/6 ＝18*6/7+6*1/7+16/7*6=（18*6+6+16*6）/7=（18+1+16）*6/7=35/7*6=303、6/5÷(1/2－4/7...