6x^2-7xy -3y^2+14x+y+a=(2x-3y+b)(.x+y+1)
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1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y)
化简:x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y)
因式分解 x-xy+3y-3x 2x+xy-y-4x+5y-6
化简求值x-4y/2x-7xy+3y×x-2xy-3y/2x+3xy-2y÷3x-6y/4x-4xy+y,其中:x=1999,y=-1
(x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)答案应为-2x-x*x-3x,
x^2-xy-6y^2+3xy+y+2
3y/x*x-y*y+x/x*x-2xy+y*y+6y*y/x*x*x-x*x*y-xy*y+y*y*y等于多少?
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
3(x-y)²-7(x-y)+8(x-y)²+6(x-y)求详细过程(2) 5xy-4x²y-8xy²+3xy-xy²+4x²y
(14x^3*y-7x^2*y^2+21xy^3)/(-7xy)
因式分解:12xy^2(y-x)+xy^3(x-y)+4x^2y(x-y)
x^2-xy-2y^2+x+7y-6
x^2+xy-6y^2-3x+6y
2x^2+3xy+y^2+x-y-6
x²+xy-2y²-x+7y-6
x²+3xy+2y-x+y-6因式分解
3/x —2/y=3 (2x-3y-xy) / (7xy+9y-6x)=
x^3+x+30x^2-4xy+4y^2+7x-14y+12