作业帮(1) -(3xy^3)^5-(-3x)^2×(-y)^6×(xy^3)^3= (2)2ab(5ab^2 +3a^2b)=(3)(-3x^2 y)×(-x^4)×(-y^3)=(4)[3^2×(a^2)^3]^2=
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(1) -(3xy^3)^5-(-3x)^2×(-y)^6×(xy^3)^3= (2)2ab(5ab^2 +3a^2b)=(3)(-3x^2 y)×(-x^4)×(-y^3)=(4)[3^2×(a^2)^3]^2=
(1) -(3xy^3)^5-(-3x)^2×(-y)^6×(xy^3)^3= (2)2ab(5ab^2 +3a^2b)=
(3)(-3x^2 y)×(-x^4)×(-y^3)=
(4)[3^2×(a^2)^3]^2=
(1) -(3xy^3)^5-(-3x)^2×(-y)^6×(xy^3)^3= (2)2ab(5ab^2 +3a^2b)=(3)(-3x^2 y)×(-x^4)×(-y^3)=(4)[3^2×(a^2)^3]^2=
(1) -(3xy^3)^5-(-3x)^2×(-y)^6×(xy^3)^3= -3^5x^5y^15-9x^2y^6x^3y^9=-243x^5y^15-9x^5y^15=-252x^5y^15
(2)2ab(5ab^2 +3a^2b)= 2abx5ab^2 +2abx3a^2b=2x5a^(1+1)b^(1+2)+2x3a^(1+2)b^(1+1)=10a^2b^3+6a^3b^2
(3)(-3x^2 y)×(-x^4)×(-y^3)=-3*(-1)*(-1)x^(2+4)y^(1+3)=-3x^6y^4
(4)[3^2×(a^2)^3]^2=[6×a^2x3]^2=36a^6x2=36a^12
【x(xy-xy)-y(x-xy)】÷3xy
已知（x+1）*（x+1）=-Iy-1I,求2（xy-（5xy）*（5xy））-3（（xy）*（xy）-xy）
5x^2y/-1/2xy*3xy^2
5xy^2-{2x^y-[3xy^2-（xy^2-2x^2y）]/（-1/2xy）}
已知(x+1)²+|y-1|=0,求2(xy-5xy²)-(3xy²-xy)得值
已知xy/x+y=1/2,则代数式3x-5xy+3y/-x+3xy-y=
(8xy-3x平方)-5xy-2(3xy-2x平方),其中,x=2,y=-1
1-(3xy-x)+【-2(2x+3xy)】
计算3xy[2xy-x(y-2)+x-1]
整式乘法..1.3xy（x²y-xy²+xy）-xy²（2x²-xy+2x）2.（x-1）（x²-4x+3）-x（x²-5x+2)
3xy(x^2-xy^2+xy)-xy^2(2x^2-xy+2x)
若x-y=4,xy=1,则(2x+y-2xy)-(3x+2y+xy)-(4xy+3y-5x)=
计算：(5-xy/x^3-x^2y)/(1-5/xy)^2*(y-x)^3
(-2xy+2x+5y)-(3xy+2y-2x)-(x+4y+xy)其中x-y=4xy=-1
化简：3x^2-[5xy-(x^y-3xy)+4x^2y-8xy]
(xy-3x²)-(-2xy-x²)+(-2x²-3)-(-5+xy)
化简（3X平方-5Xy)+{-X平方-[-3Xy+2(X平方-xy)
化简(3x^2-5xy)+{-x^2-[-3xy+2(x^2-xy)+y^2]}