mx-ny+nx-my
问题描述:
mx-ny+nx-my
答
(m+n)x-(m+n)y=(m+n)(x-y)
答
原式=MX-MY+NX-NY
=M(X-Y)+N(X-Y)
=(M+N)(X-Y)
答
mx-ny+nx-my
=mx+nx-my-ny
=x(m+n)-y(m+n)
=(m+n)(x-y)