题目内容

解比例.
(1)
6
x
=
10
7
(2)0.4:x=80%:60
(3)15:3=12:x(4)
3
4
9
10
=x:
3
5
(5)
22.4
x
=
2
3
(6)
x
12
=
7
4
:2.8.
(1)
6
x
=
10
7

10x=6×7,
10x÷10=42÷10,
x=4.2,

(2)0.4:x=80%:60,
80%x=60×0.4,
80%x÷80%=24÷80%,
x=30,

(3)15:3=12:x,
15x=12×3,
15x÷15=36÷15,
x=2.4,

(4)
3
4
9
10
=x:
3
5

9
10
x=
3
4
×
3
5

9
10
10
9
=
3
4
×
3
5
×
10
9

x=
1
2


(5)
22.4
x
=
2
3

2x=22.4×3,
2x÷2=67.2÷2,
x=33.6,

(6))
x
12
=
7
4
:2.8.
2.8x=12×
7
4

2.8x÷2.8=21÷2.8,
x=7.5.
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