4xy(5/12x^2-3xy-1/4y^2)RT
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4xy(5/12x^2-3xy-1/4y^2)RT4xy(5/12x^2-3xy-1/4y^2)RT4xy(5/12x^2-3xy-1/4y^2)RT4xy(5/12x^2-3xy-1/4y^2)=(
4xy(5/12x^2-3xy-1/4y^2)RT
4xy(5/12x^2-3xy-1/4y^2)
RT
4xy(5/12x^2-3xy-1/4y^2)RT
4xy(5/12x^2-3xy-1/4y^2)
=(4*5/12)x^(2+1)y-(4*3)x^(1+1)y^(1+1)-(4*1/4)xy^(1+2)
=5/3x^3y-12x^2y^2-xy^3
化简:3x^2-[5xy-(x^y-3xy)+4x^2y-8xy]
若x-y=4,xy=1,则(2x+y-2xy)-(3x+2y+xy)-(4xy+3y-5x)=
(-2xy+2x+5y)-(3xy+2y-2x)-(x+4y+xy)其中x-y=4xy=-1
4xy-[(x²+5xy-y²)-(3xy-1/2y)]x=3,y=-6
x^3y(-4y)^2+(-7xy)^2*(-xy)-5xy^3*(-3x)^2
5x^3y*(-3y)^2+(-6xy)^2*(-xy)+xy^3*(-4x^2)
XY(XY+3)+(XY+4)+4(X+Y+1)-(X+Y+2)
5x^2y-3xy^2+4xy-14xy^2+4xy-2x^2y(化简)
计算:5xy^2-[3xy^2-(4xy^2-2x^2y)]+2x^2y-xy^2
5xy^2-(3xy^2-(4xy^2-2x^2y))+2x^2y-xy^2求
4xy(5/12x^2-3xy-1/4y^2)RT
因式分解:12xy^2(y-x)+xy^3(x-y)+4x^2y(x-y)
-3(xy-2x²)-[y²-(5xy-4x²)+2xy]
5xy的立方-{2xy的平方-【3xy的平方-(4xy的平方-2xy的平方)】}其中x=2 y=1
已知1/x-1/y=2,求3x+7xy-3y/2x-3xy-2y答案是1/x-1/y=2(y-x)/xy=2 得:x-y=-2xy(3x+7xy-3y)/(2x-3xy-2y)=[3(x-y)+7xy]/[2(x-y)-3xy]=(-6xy+7xy)/(-4xy-3xy)=xy/(-7xy)=-1/7 谁能帮我解释一下=[3(x-y)+7xy]/[2(x-y)-3xy]=(-6xy+7xy)/(-4xy-3xy) 是怎
xy-2{xy-[3x^2y-(4xy^2+0.5xy)]+4x^2y}+6xy^2
(X-3xy+4xy-y)-[-2x-2(xy-3/2xy)-y]+6xy的过程
x²-y²+5x+3y+4(x+y-2xy)(x+y-z)+(xy-1)²