1/4x^3*(-2xy^2)+(-2x^2y)*(-1/2xy)*3xyz a(a^2+ab+b^2)+b(a^2+a
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
合并下列同类项.xy^2-1/5xy^2-3x^2y+2x^2y+3xy^2-2xy^24a^2+3b^2+2ab-4a
x²(x+y)(y-x)-xy(x+y)(x-y) 已知a+b=4,ab=-2,求多项式3a²b+3
分解因式:ab(x^2-y^2)-(a^2-b^2)(xy+1)-(a^2+b^2)(x+y)
因式分解完全平方公式1. 1-6ab+9a^2b^22. a^3-4a^2b+4ab^23. 1/4 x^2-xy+y^
化简分式;(1)3xy/42x-3xy(2)a-b/a²-b²(3)x²+2xy+y
已知代数式A=2x^2+3xy+2y-1,B=x^2-xy+x-1/2
已知代数式A=2x^3+3xy+2y-1,B=x^2-xy+x-1/2
已知A=x²-2xy+y,B=x²+2xy+y²-3,求2A-[B-(B-A)+2A+B]
1.4x^2 y+3xy^2-x^2 y-3xy^2 -3 2.3(3a^2-2ab)-2(4b^2-ab) 3.2x-
已知x^2+xy=a,y^2-xy=b,用含a、b的代数式表示x^2-3xy+4y^2的值