已知(4M-5N+17)*(4M-5N+17)+(7M-3N+1)*(7M-3N+1)=0,求M,N的值
问题描述：
已知(4M-5N+17)*(4M-5N+17)+(7M-3N+1)*(7M-3N+1)=0,求M,N的值
答
(4M-5N+17)*(4M-5N+17)+(7M-3N+1)*(7M-3N+1)=0 （4M-5N+17）+(7M-3N+1)=0 4M-5N+17=0 ,4M-5N=-17① 7M-3N+1=0 ,7M-3N=-1② ①×3－②×5得, -23M=-46 M=2 把M=2代入①得 N=5 因此M=2,N=5
记得采纳啊