问题 解答题
求未知数χ.
5χ+3=28
χ:
1
2
=12:
1
2
5÷(χ+1)=0.2.
答案

(1)5x+3=28,

5x+3-3=28-3,

5x÷5=25÷5,

x=5;

(2)χ:

1
2
=12:
1
2

1
2
x=
1
2
×12,

1
2
x÷
1
2
=6÷
1
2

x=12;

(3)5÷(χ+1)=0.2,

5÷(χ+1)×(x+1)=0.2×(x+1),

5=0.2x+0.2,

5-0.2=0.2x-0.2,

4.8÷0.2=0.2x÷0.2,

x=24.

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