1）（2m+n-p)^2 =(2m+n)^2-2p(2m+n)+p^2=4m^2+4mn+n^2-4pm-2pn+p^2(2) (x+1)^2(x-1)^2 =(x^2-1)^2=x^4-2x^2+1(3)(x+y）^2(x-y) =(x^2-y^2)(x+y)=x^3+x^2y-xy^2-y^3(4)(2a-3b+c)(c-2a+3b)=c^2-(2a-3b)^2c^2-4a^2+12ab...