5(z-4)-7(7-z)-9=12-3(9-z)答案是多少 6(2-1/3y)-1/5(10-5y)=1答案是多少

问题描述:

5(z-4)-7(7-z)-9=12-3(9-z)答案是多少 6(2-1/3y)-1/5(10-5y)=1答案是多少

5(z-4)-7(7-z)-9=12-3(9-z)分配率乘进去5z-20-49+7z-9=12-27+3z5z+7z-3z=12-27+20+499z=54z=66(2-1/3y)-1/5(10-5y)=112-2y-2+y=1-2y+y=1+2-12-y=-9y=9有什么不明白可以继续问,随时在线等....