题目
解方程
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(2)
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答案: 解:4x+3(2x−3)=12−(x+4),4x+6x−9=12−x−4,4x+6x+x=12−4+9,11x=17,x=1711;
解:3x+22−1=2x−14−2x+15,10(3x+2)−20=5(2x−1)−4(2x+1),30x+20−20=10x−5−8x−4,30x−10x+8x=−5−4,28x=−9,x=−928;
解:x+10.25−x−20.5=5,100x+10025−10x−205=5,100x+100−5(10x−20)=125,100x+100−50x+100=125,50x=−75,x=−32.