1、2/3 4/5 2/3 0.24 10 0.3 0.23 0.6 0. 18

2、( 1) 3.5*4 14

(2) 1/5 3/5

(3) 1 and 3 4 and 6 2, 5 and 6

(4)3/ 10

3. About = 10.79 is about 8.39.

4、

(1)2.5* 15=37.5 (yuan)

50-37.5= 12.5 (yuan)

(2)3/0.8=3 (pieces) ... 0.6 (RMB) A: Buy 3 sets at most.

(3) 16*0.75= 12 (km)

5*2.5= 12.5 (km)

12.5 > 12, he can walk from home to school.

(4)(46-20)*20/2=260 (square meter)

Use your head: use the backward deduction method (0.6*0.6+0.6)/0.6-0.6= 1.

P4 No.5

1、 6.9 0.72 0.007 1 0.3 1.6 0.5 4/7 1

2、

( 1) 10.26

(2) 1/8 5

(3) 50 3770

④ 1. 17 1 and1123/440

(5)450-m+n

3. BBC

4、

( 1)25.5? 2.5= 10 (unit) 0.5 (kg)

A: You need to prepare bottles like 1 1.

(2)① Solution: It costs X yuan to set up a pair of sports shoes and 2.6x yuan to set up a set of sportswear.

X+2.6x = 360

3.6x = 360

X = 100

2.6x=2.6* 100=260

A: Omit.

②300? 5-35=25 (yuan)

(3) Solution: Let the mass of the plow be x kg, and the mass of the apple be 2x kg.

2x+X = 450

3x = 450

X = 150

2x=2* 150=300

A: Omit.

Thinking: Solution: Suppose B receives X tons, then A receives (x+ 12.5) tons and C receives (x+x+12.5-25 = 2x-12.5) tons.

(x+ 12.5)+x+(2x- 12.5)= 130

4x = 130

X = 32.5

A: x+12.5 = 32.5+12.5 = 45.

c:2x- 12.5 = 2 * 32.5- 12.5 = 52.5。

A: Omit.

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