Question

平方差公式计算(x+y)^2-(x-y)^2

Answer 1

=[(x+y)+(x-y)][(x+y)-(x-y)]
=2x2y
=4xy

希望能帮你忙，不懂请追问，懂了请采纳，谢谢

Answer 2

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

Answer 3

(x+y)^2-(x-y)^2=（x+y+x-y）（x+y-x+y）=2x乘以2y=4xy

Answer 4

[（x+y）+（x-y）]*[(x+y)-(x-y)]

Answer 5

抢沙发。。。