问几道初中因式分解(1)4x(x-1)²-9x³(2)a²-四分之一b²+b-1(3)(x²+x)²-6(x²+x)-+
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问几道初中因式分解(1)4x(x-1)²-9x³(2)a²-四分之一b²+b-1(3)(x²+x)²-6(x²+x)-+
问几道初中因式分解
(1)4x(x-1)²-9x³
(2)a²-四分之一b²+b-1
(3)(x²+x)²-6(x²+x)
-+
问几道初中因式分解(1)4x(x-1)²-9x³(2)a²-四分之一b²+b-1(3)(x²+x)²-6(x²+x)-+
(1)4x(x-1)²-9x³
=x[4(x-1)^2-9x^2]
=x(2x-2+3x)(2x-2-3x)
=x(5x-2)(-x-2)
=-x(5x-2)(x+2)
(2)a²-四分之一b²+b-1
=a^2-1/4(b^2-4b+4)
=a^2-1/4(b-2)^2
=1/4[4a^2-(b-2)^2]
=1/4(2a+b-2)(2a-b+2)
(3)(x²+x)²-6(x²+x)
=(x²+x)(x²+x-6)
=x(x+1)(x+3)(x-2)
4x(x-1)²-9x³=x{2²(x-1)²-3²x²}=x(2x-2+3x)(2x-2-3x)=x(5x-2)(-x-2)=-x(5x-2)(x+2)
a²-四分之一b²+b-1=a²-(四分之一b²-b+1)=a²-(1/2b -1)²=(a+1/2b...
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4x(x-1)²-9x³=x{2²(x-1)²-3²x²}=x(2x-2+3x)(2x-2-3x)=x(5x-2)(-x-2)=-x(5x-2)(x+2)
a²-四分之一b²+b-1=a²-(四分之一b²-b+1)=a²-(1/2b -1)²=(a+1/2b -1)(a-1/2b +1)
(x²+x)²-6(x²+x)=(x²+x)(x²+x-6)=x(x+1)(x-2)(x+3)
(加分啊)
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