题目内容

(1)
6
x
=
10
7

(2)15:3=12:x
(3)
3
4
9
10
=x:
3
5

(4)
1.25
0.25
=
x
1.6

(1)
6
x
=
10
7

10x=6×7,
10x=42,
10x÷10=42÷10,
x=4.2;

(2)15:3=12:x,
15x=3×12,
15x=36,
15x÷15=36÷15,
x=2.4;

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

9
10
x=
3
4
×
3
5

9
10
x=
9
20

9
10
9
10
=
9
20
÷
9
10

x=
1
2


(4)
1.25
0.25
=
x
1.6

0.25x=1.25×1.6,
0.25x=2,
0.25x÷0.25=2÷0.25,
x=8.
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