当m取何值时,2(3m-4)的值比5(m-7)大8?
问题描述:
当m取何值时,2(3m-4)的值比5(m-7)大8?
答
2(3m-4)-5(m-7)=8
6m-8-5m+35=8
6m-5m=8+8-35
m=-19