Question

(x-y)^2+y-x 怎么等于(y-x)^2+(y-x) (x-y)^2怎么等(y-x)^2 (y-x)^2+(y-x)怎么等于（y-x)(y-x+1)

详细点？？

Answer 1

(x-y)^2+y-x (x-y)²=[-(y-x)]²=(-1)²(y-x)²=(y-x)²
=(y-x)^2+(y-x) (y-x)²=(y-x)(y-x) (y-x)=1*(y-x)
=(y-x)(y-x+1) 提取公因式

Answer 2

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

追问

(x-y)^2怎么等(y-x)^2 就这个看不明白 了