3(x+2)-l=5-2(x-2)怎样做
问题描述:
3(x+2)-l=5-2(x-2)怎样做
答
3(x+2)-1=5-2(x-2)
3x+6-1=5-2x+4
3x+5=9-2x
5x=4
x=4/5可是验算后不对啊我试过x=o.8嘛那有不对 答案就是0.8把x=0.8带入左边3(0.8+2)-1=3x2.8-1=7.4右边5-2(0.8-2)=5-2(-1.2)=5+2.4=7.4相等啊对不起,我算错了!