帮我做做这几道题,完全平方

问题描述:

帮我做做这几道题,完全平方
①(4m+n)^2 ②(y-1/2)^2 ③(-a-b)^2 ④(b-a)^2 ⑤(2x+3y)^2 ⑥(2x-3y)^2 ⑦(1/2x-2y)^2 ⑧(2xy+1/5x)^2

①(4m+n)^2=16m^2+8mn+n^2②(y-1/2)^2=y^2-y+1/4③(-a-b)^2 =a^2+2ab+b^2④(b-a)^2=b^2-2ba+a^2⑤(2x+3y)^2=4x^2+12xy+9y^2⑥(2x-3y)^2=4x^2-12xy+9y^2⑦(1/2x-2y)^2=1/4x^2-2xy+4y^2⑧(2xy+1/5x)^2=4x^2...