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(x-1)²+(2x-1)(x-1)+3x²-3
=(x-1)²+(2x-1)(x-1)+3(x²-1)
=(x-1)²+(2x-1)(x-1)+3(x+1)(x-1)
=(x-1)(x-1+2x-1+3x+3)
=(x-1)(6x+1)
=(x-1)²+(2x-1)(x-1)+3(x²-1)
=(x-1)²+(2x-1)(x-1)+3(x+1)(x-1)
=(x-1)(x-1+2x-1+3x+3)
=(x-1)(6x+1)
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展开全部
解:原式=(x-1)[(x-1)+(2x+1)+(3x+3)]
=(x-1)(6x+3)
=3(x-1)(2x+1)
当x=-1/2时
原式=3(-1/2-1)(-1+1)
=0
=(x-1)(6x+3)
=3(x-1)(2x+1)
当x=-1/2时
原式=3(-1/2-1)(-1+1)
=0
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