计算(2x²-(2/1)+3x)-4(x-x²+(2/1)
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计算(2x²-(2/1)+3x)-4(x-x²+(2/1)
计算(2x²-(2/1)+3x)-4(x-x²+(2/1)
计算(2x²-(2/1)+3x)-4(x-x²+(2/1)
原式=2x²-1/2+3x-4x+4x²-2
=6x²+7x-5/2