问题 解答题
求未知数χ.
(1)χ-
1
3
χ=
3
10

(2)5χ-2.5×4=0.5
(3)
1
6
:χ=
3
10
3
5
答案

(1)x-

1
3
x=
3
10

2
3
x=
3
10

2
3
2
3
=
3
10
÷
2
3

x=

3
10
×
3
2

x=

9
20

(2)5x-2.5×4=0.5,

5x-10=0.5,

5x-10+10=0.5+10,

5x=10.5,

5x÷5=10.5÷5,

x=2.1;

(3)

1
6
:x=
3
10
3
5

3
10
x=
1
6
×
3
5

3
10
3
10
=
1
10
÷
3
10

x=

1
3

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