问题
解答题
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答案
(1)2x+8=38,
2x+8-8=38-8,
2x÷2=30÷2,
x=15;
(2)8x-9=39,
8x-9+9=39+9,
8x÷8=48÷8,
x=6;
(3)58-7x=9,
58-7x+7x=9+7x,
58-9=9+7x-9,
49÷7=7x÷7,
x=7;
(4)0.6x+2.4=3.6,
0.6x+2.4-2.4=3.6-2.4,
0.6x÷0.6=1.2÷0.6,
x=2;
(5)128+13x=297,
128+13x-128=297-128,
13x÷13=169÷13,
x=13;
(6)22.5-5x=9.5,
22.5-5x+5x=9.5+5x,
22.5-9.5=9.5+5x-9.5,
13÷5=5x÷5,
x=2.6.