(2x+y-1)²
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(2x+y-1)²
(a+b)²-4(a+b+1)
4+12(x-y)+9(x-y)²
x³-9x
6xy²-9x²y-y³
(a+b)²-4(a+b+1)
4+12(x-y)+9(x-y)²
x³-9x
6xy²-9x²y-y³
![(2x+y-1)²](/uploads/image/z/8096651-35-1.jpg?t=%EF%BC%882x%2By-1%EF%BC%89%26%23178%3B)
第一个不能分解因式.
(a+b)²-4(a+b-1)=(a+b)²-4(a+b)+4=(a+b-2)²
4+12(x-y)+9(x-y)²=(2+3x-3y)²
x³-9x=x(x²-9)=x(x+3)(x-3)
6xy²-9x²y-y³=y(6xy-9x²-y²)=-y(9x²-6xy+y²)=-y(3x-y)²
(a+b)²-4(a+b-1)=(a+b)²-4(a+b)+4=(a+b-2)²
4+12(x-y)+9(x-y)²=(2+3x-3y)²
x³-9x=x(x²-9)=x(x+3)(x-3)
6xy²-9x²y-y³=y(6xy-9x²-y²)=-y(9x²-6xy+y²)=-y(3x-y)²
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