问题 解答题
解比例.
0.7
X
=
14
5
8:30=24:X
3
5
6
7
=X:
5
4
40
24
=
5
X
6.5:x=3.25:4
2
3
5
6
=X:9.
答案

(1)

0.7
x
=
14
5

14x=0.7×5,

14x÷14=3.5÷14,

x=

1
4

(2)8:30=24:X,

8x=30×24,

8x÷8=720÷8,

x=90;

(3)

3
5
6
7
=X:
5
4

6
7
x=
3
5
×
5
4

6
7
x÷
6
7
=
3
4
÷
6
7

x=

7
8

(4)

40
24
=
5
x

40x=24×5,

40x÷40=120÷40,

x=3;

(5)6.5:x=3.25:4,

3.25x=6.5×4,

3.25x÷3.25=26÷3.25,

x=8;

(6)

2
3
5
6
=X:9,

5
6
x=
2
3
×9,

5
6
x÷
5
6
=6÷
5
6

x=

36
5

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