(2x-1)(x-3)-(x-1)²
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(2x-1)(x-3)-(x-1)²
(2x-1)(x-3)-(x-1)²
(2x-1)(x-3)-(x-1)²
(2x-1)(x-3)-(x-1)²=2x²-6x-x+3-(x²-2x+1)=2x²-7x+3-x²+2x-1=x²-5x+2
原式=2x²-6x-x+3-(x²-2x+1)
=2x²-7x+3-x²+2x-1
=x²-5x+2