代数计算题(b-2a)(b+2a)-(b+a)²(4x³y+6x²y²-2xy&
2个回答
=b^2-4a^2-(b^2+2ab+a^2)
=-5a^2-2ab
=2xy(2x^2+3xy-y)/(2xy)
=2x^2+3xy-y
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