Question

关于因式分解这一方面的2道题.高手进.急用.

Answer 1

m^2+mn-7m-7n=m(m-7)+n(m-7)=(m+n)(m-7)=8-1/8=7又7/8

M-N=ab+1-a-b=a(b-1)+(1-b)=(a-1)(b-1) a>1