计算2x(1-3x)-(2x-1)(4-3x)
2个回答
2x(1-3x)-(2x-1)(4-3x)
=2x-6x²-(8x-6x²-4+3x)
=2x-6x²-11x+6x²+4
=-9x+4
4x²+y²=(2x-y)²+4xy
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