几道分解因式题①分解因式(x-y)(x-y-1)-12=②把x(x-1)(x-2)-6分解因式是——————③8002-2×800×799×7992(利用分解因式计算)④(a+b)2-2a2+2b2+(b-a)2,已知a=11/1

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几道分解因式题①分解因式(x-y)(x-y-1)-12=②把x(x-1)(x-2)-6分解因式是——————③8002-2×800×799×7992(利用分解因式计算)④(a+b)2-2a2+2b2+

几道分解因式题①分解因式(x-y)(x-y-1)-12=②把x(x-1)(x-2)-6分解因式是——————③8002-2×800×799×7992(利用分解因式计算)④(a+b)2-2a2+2b2+(b-a)2,已知a=11/1
几道分解因式题
①分解因式(x-y)(x-y-1)-12=
②把x(x-1)(x-2)-6分解因式是——————
③8002-2×800×799×7992(利用分解因式计算)
④(a+b)2-2a2+2b2+(b-a)2,已知a=11/13,b=-1/2

几道分解因式题①分解因式(x-y)(x-y-1)-12=②把x(x-1)(x-2)-6分解因式是——————③8002-2×800×799×7992(利用分解因式计算)④(a+b)2-2a2+2b2+(b-a)2,已知a=11/1
①原式=(x-y)(x-y-1)-12
=(x-y)2-(x-y)-12
=(x-y-4)(x-y+3)
②原式=x×(x^2-3x+2)-6
=x^3-3x^2+2x-6
=x^2(x-3)+2(x-3)
=(x^2+2)(x-3)
③800^2-2×800×799+799^2
=(800-799)^2
=1
④(a+b)^2-2a^2+2b^2+(b-a)^2
=a^2+2ab+b^2-2a^2+2b^2+b^2-2ab+a^2
=4b^2
=4×(-1/2)2
=1