A-2B
=2x+3xy+3x-1-2(x^2+xy-2x-2)
=2x+3xy+3x-1-2x^2-2xy+4x+4
=-2x^2+xy+9x+3
若A=2x+3xy+3x-1,B=x^2+xy-2x-2,求A-2B(过程)
若A=2x+3xy+3x-1,B=x^2+xy-2x-2,求A-2B(过程)
数学人气:648 ℃时间:2019-08-20 00:04:59
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