问题
解答题
解方程
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答案
(1)7x-2×9=80
7x-18=80,
7x-18+18=80+18,
7x=98,
7x÷7=98÷7,
x=14;
(2)7+5x=42
7-7+5x=42-7,
5x=35,
5x÷5=35÷5,
x=7;
(3)13x-7.5x=18.7
(13-7.5)x=18.7,
5.5x=18.7,
5.5x÷5.5=18.7÷5.5,
x=3.4;
(4)(32-x)×6=108
(32-x)×6÷6=108÷6,
32-x=18,
32-x+x=18+x,
18+x=32,
18-18+x=32-18,
x=14.