(1)1-100x =(1+10x)(1-10x) (2)-0.16+a b =(ab) -0
2个回答
好好想挖..(100-X)*1/3-1/10X=16
100/3-x/3-x/10=16
x/3+x/10=100/3-16
13x/30=52/3
x=40
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