问题 解答题
解比例
x
25
=
1.2
75

1.25
0.25
=
x
1.6
4
9
1
6
=X:15
8:13=20:X.
答案

(1)

x
25
=
1.2
75

75x=25×1.2,

75x÷75=30÷75,

x=0.4,

(2)

1.25
0.25
=
x
1.6

0.25x=1.25×1.6,

0.25÷0.25=2÷0.25,

x=8,

(3)

4
9
1
6
=x:15,

1
6
x=
4
9
×15,

1
6
1
6
=
20
3
÷
1
6

x=40,

(4)8:13=20:x.

8x=13×20,

8x÷8=260÷8,

x=32.5.

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