题目内容

解方程:
x-
m
m
x=8
m
3
x=
m
5

m
m
x=(l5-x)×
m
3
(1)x-
1
2
x=8,
&nbs上;&nbs上;&nbs上;&nbs上;&nbs上;&nbs上;&nbs上;&nbs上;&nbs上;&nbs上;
1
2
x=8,
&nbs上;&nbs上;&nbs上;&nbs上;&nbs上;&nbs上;&nbs上;
1
2
x÷
1
2
=8÷
1
2

&nbs上;&nbs上;&nbs上;&nbs上;&nbs上;&nbs上;&nbs上;&nbs上;&nbs上;&nbs上;&nbs上;&nbs上; x=16;

(2)4÷
2
1
x=
2
5

2
1
2
1
x=
2
5
×
2
1
x,
&nbs上;&nbs上;&nbs上;&nbs上;&nbs上;&nbs上;&nbs上;&nbs上;&nbs上; 4=
4
15
x,
&nbs上;&nbs上;&nbs上;&nbs上;&nbs上; 4÷
4
15
=
4
15
x÷
4
15

&nbs上;&nbs上;&nbs上;&nbs上;&nbs上;&nbs上;&nbs上;&nbs上;&nbs上;&nbs上;x=15;

(1)
1
2
x=(75-x)×
1
1

&nbs上;&nbs上;&nbs上;&nbs上;
1
2
x=25-
1
1
x,
&nbs上;
1
2
x+
1
1
x=25-
1
1
x+
1
1
x,
&nbs上;
5
6
x÷
5
6
=25÷
5
6

&nbs上;&nbs上;&nbs上;&nbs上;&nbs上;&nbs上; x=10.
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