Question

(x加2y减1)(x减2y加1)怎么计算

Answer 1

(x+2y-1)(x-2y+1)=[x+(2y-1)][x-(2y-1)]平方差公式
=x^2 -(2y-1)^2
=x^2-(4y^2 -4y +1)
=x^2-4y^2 +4y -1
望采纳

Answer 2

硬算
原式=x²+2xy-x-2xy-4y²+2y+x+2y-1
=x²-4y²+4y-1

Answer 3

追答

望采纳，谢谢^ω^

望采纳，谢谢^ω^

Answer 4