(x-2y-1)(x+2y-1) (a-b-2c)^2
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(x-2y-1)(x+2y-1)(a-b-2c)^2(x-2y-1)(x+2y-1)(a-b-2c)^2(x-2y-1)(x+2y-1)(a-b-2c)^2(x-2y-1)(x+2y-1)=(x-1)
(x-2y-1)(x+2y-1) (a-b-2c)^2
(x-2y-1)(x+2y-1) (a-b-2c)^2
(x-2y-1)(x+2y-1) (a-b-2c)^2
(x-2y-1)(x+2y-1)
=(x-1)^2-(2y)^2
=x^2-2x+1-4y^2
=x^2-2x-4y^2+1
(a-b-2c)^2
=a^2-2a(b+2c)+(b+2c)^2
=a^2-2ab-4ac+b^2+4bc+4c^2
=a^2+b^2+4c^2-2ab-4ac+4bc
(x-2y-1)(x+2y-1)
=[(x-1)-2y][(x-1)+2y]
=(x-1)²-4y²
=x²-2x+1-4y²
(a-b-2c)^2
=(a-b)²-4c(a-b)+4c²
=a²+b²+4c²-2ab-4bc+4ac
1
原式=[x-(2y-1)[x+(2y-1)]
=x²-(2y-1)²
=x²-(4y²-4y+1)
=x²-4y²+4y-1
1、(x-2y-1)(x+2y-1)
=(x-2y)(x+2y)-(x-2y)-(x+2y)+1
=x²-4y²-x+2y-x-2y+1
=x²-4y²-2x+1
2、(a-b-2c)²
=(a-b)²-2(a-b)×2c+4c²
=a²-2ab+b²-4c(a-b)+4c²
=a²-2ab+b²-4ac+4bc+4c²
=a²+b²+4c²-2ab-4ac+4bc
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