( 1/8+7/24)x 18 =(3/24+7/24)x 18 = 10/24x 18 = 10/4x 3 = 30/。

4/9x 1/4x 9/ 13 = 1/9x 9/ 13 = 1/ 13

87x5/86 = (86+1) x5/86 = 86x5/86+1x5/86 = 5+5/86 = 5 and 5 of 86;

2

(1) 450-450x4/9 = 450-50x4 = 250 (m)

(2)

The first day: 36 pages;

See the next day: 36x3/4 = 9x3 = 27 (page);

On the third day, I saw: 27x2/3 = 9x2 =18 (page);

Three days and one day * * * See: 36+27+ 18=8 1 (page).

(3)

5x200x4/5=200x4=800 (yuan);

[5x (3/5)] x [200x (1-4/5)] = 3x [200x (1/5)] = 3x40 =120 (yuan);

A * * *: 800+ 120 = 920 (yuan)

( 1-5/8) x = 12

(8/8-5/8)x= 12

(3/8)x= 12

x= 12*8/3

x = 32

X- one ninth x= 160

9x-x= 160*9

8x= 160*9

x= 160*9/8

x= 180

5x 7 times 1/8 = 16 15.

56 * (5x of 7 times one eighth) = 56 * (05 of 65438+65438+6)

5x=56* 15/ 16

x=(7* 15/2)/5

x=7*3/2=2 1/2

How much is a football 84y Bi Yifu table tennis racket? How much is one third of the table tennis racket?

84y/( 1+ 1/3)= 84y * 3/4 = 2 1y * 3 = 63y

Four fifths -2 = 46?

1-8 5x = 2/3

5x of 8 =1-2/3.

5x/8= 1/3

5x=8/3

x=8/3/5=8/ 15

( 1+3 1) x = 4/5

(4/3) x = 4)x=5。

4x=4*3/5

x=3/5

A quarter of the number of people on deck is equal to 3/7 of the number of people in Class B. How many people does Class A with 49 people know?

49x3/7=7x3=2 1

Class A: 21(1/4) = 21x 4 = 84 (person)

A train travels from A to B at the speed of 140km/ h, and the travel time is two hours. How many meters does it take to get to B?

Two hours is enough: 140x2=280(km).

Whole journey: 280/(5/7)=280x7/5=392(km)

Ok: 392-280= 1 12 (km)