问题 解答题
解比例.
0.7
X
=
14
5

8:30=24:X
2
3
5
6
=X:9
3
5
6
7
=X:
5
4
答案

0.7
x
=
14
5

14x=0.7×5,

14x=3.5,

14x÷14=3.5÷14,

x=0.25;

(2)8:30=24:x,

8x=24×30,

8x=720,

8x÷8=720÷8,

x=90;

(3)

2
3
5
6
=x:9,

5
6
x=
2
3
×9,

5
6
x=6,

5
6
5
6
=6÷
5
6

x=

36
5

(4)

3
5
6
7
=x:
5
4

6
7
x=
3
5
×
5
4

6
7
x=
3
4

6
7
6
7
=
3
4
÷
6
7

x=

7
8

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