题目内容

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.
(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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