解方程组 用简便方法计算 3(x-1)=y+5① 5(y-1)=3(x-1)+18②
问题描述:
解方程组 用简便方法计算 3(x-1)=y+5① 5(y-1)=3(x-1)+18②
答
3(x-1)=y+5①
5(y-1)=3(x-1)+18②
5(y-1)=y+5+18
5y-5=y+23
y=7
3(x-1)=7+5
x=5