化简x^2y-3xy^2+2yx^2-y^2x 3(4a^2b-5ab^2)-(3a^2b-4ab^2) x-[3x-2
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化简x^2y-3xy^2+2yx^2-y^2x 3(4a^2b-5ab^2)-(3a^2b-4ab^2) x-[3x-2(1+2x)]
2(x^2-xy)-3(2x^2-3xy)-2[x^2-(2x^2-xy+y^2)]
2(x^2-xy)-3(2x^2-3xy)-2[x^2-(2x^2-xy+y^2)]
![化简x^2y-3xy^2+2yx^2-y^2x 3(4a^2b-5ab^2)-(3a^2b-4ab^2) x-[3x-2](/uploads/image/z/19558141-61-1.jpg?t=%E5%8C%96%E7%AE%80x%5E2y-3xy%5E2%2B2yx%5E2-y%5E2x+3%284a%5E2b-5ab%5E2%29-%283a%5E2b-4ab%5E2%29+x-%5B3x-2)
x^2y-3xy^2+2yx^2-y^2x
=3x²y-4xy²
3(4a^2b-5ab^2)-(3a^2b-4ab^2)
=12a²b-15ab²-3a²b+4ab²
=9a²b-11ab²
x-[3x-2(1+2x)]
=x-3x+2(1+2x)
=-2x+2+4x
=2x+2
2(x^2-xy)-3(2x^2-3xy)-2[x^2-(2x^2-xy+y^2)]
=2x²-2xy-6x²+9xy-2x²+4x²-2xy+2y²
=-2x²+5xy+2y²
=3x²y-4xy²
3(4a^2b-5ab^2)-(3a^2b-4ab^2)
=12a²b-15ab²-3a²b+4ab²
=9a²b-11ab²
x-[3x-2(1+2x)]
=x-3x+2(1+2x)
=-2x+2+4x
=2x+2
2(x^2-xy)-3(2x^2-3xy)-2[x^2-(2x^2-xy+y^2)]
=2x²-2xy-6x²+9xy-2x²+4x²-2xy+2y²
=-2x²+5xy+2y²
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第一题:8x^3y-4x^2y-2xy 第二题:6ab^3-2a^2b^2+4a^2B