3x²-2x-(-4x²+3x-2)
=3x²-2x+4x²-3x+2
=7x²-5x+2
2(x²-5x)-3(2x²-4x-1)
=2x²-10x-6x²+12x+3
=-4x²+2x+3
3x²-2x-(-4x²+3x-2)和2(x²-5x)-3(2x²-4x-1)(列式子)
3x²-2x-(-4x²+3x-2)和2(x²-5x)-3(2x²-4x-1)(列式子)
数学人气:116 ℃时间:2020-01-25 15:58:55
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