Question

运用乘法公式(x-y+1)(x+y-5)

运用乘法公式(x-y+1)(x+y-5)

Answer 1

(x-y+1)(x+y-5)=(x-y)(x+y)-5(x-y)+(x+y)-5=x^2-y^2-4x+6y-5
这样可行

Answer 2

干什么 求结果？ x2-5x-y2+5y+x+y-

Answer 3

（X-Y-I)(X+Y+5)=X²-Y²+4X-6Y-5

Answer 4

结果：(x-y-I)(x+y+5)=x²-y²-4x+6y-5