已知A=4x²-7x-1B=-2x²+3x-4求2A-3B
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已知A=4x²-7x-1B=-2x²+3x-4求2A-3B
已知A=4x²-7x-1B=-2x²+3x-4求2A-3B
已知A=4x²-7x-1B=-2x²+3x-4求2A-3B
2A-3B
=2(4x²-7x-1)-3(-2x²+3x-4)
=8x²-14x-2+6x²-9x+12
=14x²-23x+10
2A-3B
=2(4x²-7x-1)-3(-2x²+3x-4)
=8x²-14x-2+6x²-9x+12
=14x²-23x+10