a^4-16a^2ying shi fen jie(a-2b)^2-(2a+b)^2x^3-8x^2y^2+16xy^4
已知:A=X*X-3xy+y*y,B=2x*x+xy-3y*3y.求A+B,A-B,A+2B
3a-3b/10ab*25a^b3/a^-b^= x^-4y^/x^+2xy+y^/x+2y/2x^+2xy
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|+
(1)16-(2a+3b)²(2)-36x²+12xy-y²(3)4x(a-b)-8y(b
(x-A)*(B-y)=x^2-9xy+8y^2,求A,B
已知2x²+xy=a,3y²+2xy=b,求4x²+8xy+9y²的值(用a,b
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
已知A=4X平方减4XY+Y平方,B=x平方+XY减5Y平方 求(3A-2B)-(2A+B)
已知A=4x²-4xy+y²,B=x²+xy-5y²,求:⑴A-3B;⑵2A+B
(1)3a/4b·16b/9a^2 (2)12xy/5a÷8x^2y (3)(-3xy)÷2y^2/3x (4)x+y/
x²(x+y)(y-x)-xy(x+y)(x-y) 已知a+b=4,ab=-2,求多项式3a²b+3
求大手啊6xy[x^2(5x+3)-3x^2(-4y)] 还有 [(a+b)(a-b)-(a-b)^2]除以4b 还有[