x的立方+2x的平方-6-5x因式分解

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x的立方+2x的平方-6-5x因式分解

x的立方+2x的平方-6-5x因式分解
x的立方+2x的平方-6-5x因式分解

x的立方+2x的平方-6-5x因式分解
=x³+2x²-5x-6
=(x³-x)+(2x²-4x-6)
=x(x²-1)+2(x²-2x-3)
=x(x-1)(x+1)+2(x-3)(x+)
=(x+1)[x(x-1)+2(x-3)]
=(x+1)(x²+x-6)
=(x+1)(x-2)(x+3)

(x+1)(x-2)(x+3)

X^3+2X^2-5X-6
=X^3+2X^2-3X-2X-6
=X(X+3)(X-1)-2(X+3)
=(X+3)(X^2+3X-2)X^3+2X^2-3X-2X-6 =X(X+3)(X-1)-2(X+3) 这两步中间是怎么回事1,裂项:-5X=-3X-2X, 2,X^3+2X^2-3X =X(X^2+2X-3) =X(X-1)(X+3)。 X^3+2X...

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X^3+2X^2-5X-6
=X^3+2X^2-3X-2X-6
=X(X+3)(X-1)-2(X+3)
=(X+3)(X^2+3X-2)

收起

X³+2X²-5X-6
=X³+2X²-3X-2X-6
=X*(X²+2X-3)-2(X+3)
=X*(X+3)*(X-1)-2(X+3)

原式=X(X+3)(X-1)-2(X+3)
=(X+3)[X(X-1)-2]
=(X+3)(X^2-X-2)
=(X+3)(X-2)(X+1)
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