题目内容

解比例.
8:x=9:7
4
9
1
6
=x:15
X
2
=
0.15
0.6
2.5
12
=
7.5
X
(1)8:x=9:7,
9x=8×7,
9x÷9=56÷9,
x=6
2
9


(2)
4
9
1
6
=x:15,
1
6
x=
4
9
×
15,
1
6
x÷
1
6
=
20
3
÷
1
6

x=40;

(3)
x
2
=
0.15
0.6

0.6x=2×0.15,
0.6x÷0.6=0.3÷0.6,
x=0.5;

(4)
2.5
12
=
7.5
X

2.5x=12×7.5,
2.5x=90÷2.5,
x=36.
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