题目内容

解比例或方程.
0.8x:1.2=3:0.9
5×70%+0.4x=9.1
3
4
x-
2
5
x=
7
10

3
7
1
3
=x:
7
12

(1)0.8x:1.2=3:0.9,
0.8x×0.9=1.2×3,
0.72x=3.6,
0.72x÷0.72=3.6÷0.72,
x=5;

(2)5×70%+0.4x=9.1,
3.5+0.4x=9.1,
3.5+0.4x-3.5=9.1-3.5,
0.4x=5.6,
0.4x÷0.4=5.6÷0.4,
x=14;

(3)
3
4
x-
2
5
x=
7
10

7
20
x=
7
10

7
20
7
20
=
7
10
÷
7
20

x=2;

(4)
3
7
1
3
=x:
7
12

1
3
x=
3
7
×
7
12

1
3
1
3
=
3
7
×
7
12
÷
1
3

x=
3
7
×
7
12
×3,
x=
3
4
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