-3(2x-xy)-4(-6+xy+x.其中x=1,y=-1
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-3(2x-xy)-4(-6+xy+x.其中x=1,y=-1
-3(2x-xy)-4(-6+xy+x.其中x=1,y=-1
-3(2x-xy)-4(-6+xy+x.其中x=1,y=-1
-3(2x-xy)-4(-6+xy+x)=-6x+3xy+24-4xy-4x=-10x-xy+24=-10+1+24=15
先化简.后代入求值
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
-3(2x^2-xy)+4(x^2+xy-6)
4(x²+xy-6)-3(2x²-xy)
-3(2x²-xy)+4(x²+xy-6)
5x^3y*(-3y)^2+(-6xy)^2*(-xy)+xy^3*(-4x^2)
3xy(x^2y-xy^2+xy)-xy^2(2x^2-6xy+2x)过程
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
3xy(x^2-xy^2+xy)-xy^2(2x^2-xy+2x)
因式分解 x-xy+3y-3x 2x+xy-y-4x+5y-6
(-3x^y+2xy)-( )=4x^+xy
代数式求值!2x^2+3xy^2-4xy^2-6xy^2+3x-5-5x
诺x+y=6,xy=4 求(5x-4y-3xy)-(8x-y+2xy)
化简:3x^2-[5xy-(x^y-3xy)+4x^2y-8xy]
x^+2xy+y^+4=16 x^-2xy+y^=16 求(3xy+6y^)+|x^-(2xy+2y^-3x^)|的值
-3(2x-xy)-4(-6+xy+x.其中x=1,y=-1
因式分解X^3-2xy+xy^2
2x²y-3(2xy-xy)-xy