1、1-x²+2xy-y²
=1-(x²-2xy+y²)
=1-(x-y)²
=(1-x+y)(1+x-y)
2、(a+b)(a-b)-(b+a)
=(a+b)(a-b-1)
3、2x²-4xy+2y²
=2(x²-2xy+y²)
=2(x-y)²
4、10^5-5*10^4+2*10^3
=10^3×(10²-5×10-2)
=1000×(100-52)
=1000×48
=480003 4题目呢10^5-5*10^4+2*10^3=10^3×(10²-5×10+2)=1000×(100-48)=1000×52=52000第5题呢多多 追问 多多加分x²-y²-x+y=(x²-y²)-(x-y)=(x+y)(x-y)-(x-y)=(x+y-1)(x-y)6.(x^2-5)^2+8(5-x^2)+16因式分解
