计算 -4x^2y+3xy^2+x^2y-2xy^2先化简,在求职 3xy+2(x^2+2y)-(3xy+3x^2)其中x=-2 y=-1
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![计算 -4x^2y+3xy^2+x^2y-2xy^2先化简,在求职 3xy+2(x^2+2y)-(3xy+3x^2)其中x=-2 y=-1](/uploads/image/z/1605219-51-9.jpg?t=%E8%AE%A1%E7%AE%97+-4x%5E2y%2B3xy%5E2%2Bx%5E2y-2xy%5E2%E5%85%88%E5%8C%96%E7%AE%80%EF%BC%8C%E5%9C%A8%E6%B1%82%E8%81%8C+3xy%2B2%EF%BC%88x%5E2%2B2y%EF%BC%89-%283xy%2B3x%5E2%29%E5%85%B6%E4%B8%ADx%3D-2+y%3D-1)
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计算 -4x^2y+3xy^2+x^2y-2xy^2先化简,在求职 3xy+2(x^2+2y)-(3xy+3x^2)其中x=-2 y=-1
计算 -4x^2y+3xy^2+x^2y-2xy^2
先化简,在求职 3xy+2(x^2+2y)-(3xy+3x^2)其中x=-2 y=-1
计算 -4x^2y+3xy^2+x^2y-2xy^2先化简,在求职 3xy+2(x^2+2y)-(3xy+3x^2)其中x=-2 y=-1
-4x^2y+3xy^2+x^2y-2xy^2
=( -4x^2y+x^2y)+(3xy^2-2xy^2)
= -3x^2y+xy^2
3xy+2(x^2+2y)-(3xy+3x^2)
=3xy+2x^2+4y-3xy-3x^2
=-x^2+4y
x=-2 y=-1时,-x^2+4y=-(-2)^2+4(-1)=-4-4=-8
合并同类项,-3x^2y+xy^2 =xy(-3x+y)=2(6-1)=2*5=10