问题
解答题
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答案
(1)5x+3=28,
5x+3-3=28-3,
5x÷5=25÷5,
x=5;
(2)χ:
=12:1 2
,1 2
x=1 2
×12,1 2
x÷1 2
=6÷1 2
,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.