题目内容

求未知数x:
x:
5
6
=0.9

9x-1.8=5.4
3
5
7
12
=
9
10
:x
(1)x:
5
6
=0.9,
x:
5
6
=0.9:1,
x=
5
6
×0.9,
x=0.75;

(2)9x-1.8=5.4,
9x-1.8+1.8=5.4+1.8,
9x=7.2,
9x÷9=7.2÷9,
x=0.8;

(3)
3
5
7
12
=
9
10
:x,
3
5
x=
7
12
×
9
10

3
5
x=
7
40

3
5
5
3
=
7
40
×
5
3

x=
7
24
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