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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