(a-2)(a^2+2a+4)=a^3-8,(2x-y)(4x^2+2xy+y^2)=8x^3-y^3
(a-2)(a^2+2a+4)=a^3-8,(2x-y)(4x^2+2xy+y^2)=8x^3-y^3
3a-3b/10ab*25a^b3/a^-b^= x^-4y^/x^+2xy+y^/x+2y/2x^+2xy
已知:A=X*X-3xy+y*y,B=2x*x+xy-3y*3y.求A+B,A-B,A+2B
设A=2x-3xy+y+x-3y,B=4x-6xy+2y+4x-y,若|x-3a|+(y+3)=0,且B-2A=a.求A
(1)1-a/a*a-2a+1 (2)3x-4y/8xy-6x*x (3)2x*xy(x-y)/12xy*y(y-x)
x²(x+y)(y-x)-xy(x+y)(x-y) 已知a+b=4,ab=-2,求多项式3a²b+3
A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²+3x-y,若x=
设A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²-3x-y,若x
设A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²+3x-y.若x
分解因式1.2a(x-y)-3b(y-x)2.-x^y-2xy+35y3.a^(x-y)-4b^(x-y)若|a+2|+
因式分解:4a^2(x-y)+9(y-x) -4x^2y^2+x^3y+4xy^3
若A=2x²-4xy-2y²-2x+2y,B=4x²-6xy+2y²-3x-y.