3x³-2x²-1怎么因式分解?
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3x³-2x²-1怎么因式分解?
解:原式3x³-2x²-1
=3x³-3x²+x²-1
=(3x³-3x²)+(x²-1)
=3x²(x-1)+(x+1)(x-1)
=(x-1)(3x²+x+1)
解:原式3x³-2x²-1
=3x³-3x²+x²-1
=(3x³-3x²)+(x²-1)
=3x²(x-1)+(x+1)(x-1)
=(x-1)(3x²+x+1)
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原式=3x³-3-2x²+2
=3(x³-1)-2(x²-1)
=3(x-1)(x²+x+1)-2(x-1)(x+1)
=(x-1)[3(x²+x+1)-2(x+1)]
=(x-1)(3x²+3x+3-2x-2)
=(x-1)(3x²+x+1)
=3(x³-1)-2(x²-1)
=3(x-1)(x²+x+1)-2(x-1)(x+1)
=(x-1)[3(x²+x+1)-2(x+1)]
=(x-1)(3x²+3x+3-2x-2)
=(x-1)(3x²+x+1)
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展开全部
3x³-2x²-1
=3x³-3x²+x²-1
=3x²(x-1)+(x+1)(x-1)
=(x-1)(3x²+x+1)
=3x³-3x²+x²-1
=3x²(x-1)+(x+1)(x-1)
=(x-1)(3x²+x+1)
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评论
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