1、0.5x+30=15.5x 2、3.2x-12.6=1.2x
2个回答
1、0.5x+30=15.5x
30=(15.5-0.5)x
30=15x
x=2
2、3.2x-12.6=1.2x
(3.2-1.2)x=12.6
2x=12.6
x=6.3
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