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多项式4Xy-3X的2次方-Xy+y的2次方+X的2次方与3...

因为A=x²-3xy+y²,B=2x²+2xy-3y² 所以A+B=x²-3xy+y²+2x²+2xy-3y²=3x²-xy-2y² A-2B=x²-3xy+y²-2(2x²+2xy-3y²)=x²-3xy+y²-4x²-4xy+6y²=-3x..

多项式4xy 3 -2x 3 y-9+3x 2 y 2 的各项为4xy 3 ,-2x 3 y,-9,3x 2 y 2 ,按x的降幂排列为-2x 3 y+3x 2 y 2 +4xy 3 -9.故答案为:-2x 3 y+3x 2 y 2 +4xy 3 -9.

6mx²-8nxy+3x-4xy-x²+y-3 =(6m-1)x²-(8n+4)xy+3x+y-3 ∵多项式中不含二次项 ∴6m-1=0,8n+4=0 ∴m=1/6,n=-1/2 ∴3m-4n=5/2

6mx²-8nxy+3x-4xy-x²+y-3 =x²(6m-1)-xy(8n+4)+3x+y-3 ∴6m-1=0 8n+4=0 m=1/6 n=-1/2

A=3x^2y-4xy^2 B=-x^2y-2xy^2 A+B=3x^2y-4xy^2-x^2y-2xy^2=2x^2y-6xy^2 A+B+C=0 C=-(A+B)=-(2x^2y-6xy^2)=6xy^2-2x^2y

∵A=3X²Y-4XY²,B=-X²Y-2XY² A+2B+C=0 ∴C=-A-2B =-(3x²y-4xy²)+2(x²y+2xy²) =-x²y+8xy² =xy(8y-x) ∵x=-1/2,y=-1 ∴C=1/2(-8+1/2) =-15/4

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