Question

(x+2y-1)(x-2y+1)-(x-2y-1)^2

Answer 1

你好，7000水0007 >3<

(x+2y-1)(x-2y+1)-(x-2y-1)^2
=[x^2-(2y-1)^2]-(x-2y-1)^2
=x^2-(2y-1)^2-x^2-2x(2y-1)+(2y-1)^2
=2x(2y-1)
=4xy-2x

很高兴为您回答问题。祝您学习进步哦0 v 0

Answer 2

(x+2y-1)(x-2y+1)-(x-2y-1)²
=[x-(1-2y)][(x+(1-2y)]-(x-2y-1)²
=x²-(1-2y)²-[x²-2x(2y+1)+(2y+1)²]
=x²-1+4y-4y²-x²+4xy+2x-4y²-4y-1
=-2-8y²+4xy+2x