问题 解答题
解比例.
1
4
2
5
=1.875:x
1.2:7.2%=x:
1
5
答案

(1)

1
4
2
5
=1.875:x,

1
4
x=
2
5
×
1.875,

1
4
x÷
1
4
=0.75÷
1
4

x=3;

(2)1.2:7.2%=x:

1
5

7.2%x=1.2×

1
5

7.2%x÷7.2%=0.24÷7.2%,

x=3

1
3

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