1、a^3+b^3=(a+b)^3-3ab( ) 2、(x+y)( )=x^5-y^5 括号里填什么
ab-a*1/3b=?3x*5x-3x*2y=?
下列各式添括号正确的是:( ) A.-x+y=-(y-x) B.x-y=-(x+y) C.10-m=5(2-m) D.3
x²(x+y)(y-x)-xy(x+y)(x-y) 已知a+b=4,ab=-2,求多项式3a²b+3
有理数ab定义:a*b=3a+2b.则[(x+y)*(x-y)]*3x.怎么化简?
ab是有理数a*b=2a-3b求【(x-y)*(x+y)】*x的值
计算:(2a-5b)(2a^2-3ab+b^2) (3x+2y)(2x+3y)-(x-3y)(3x+4y)
1.已知集合A={(x,y)|y=2x+1},B={(x,y)|y=x+3},a∈A,b∈B,求a
3a-3b/10ab*25a^b3/a^-b^= x^-4y^/x^+2xy+y^/x+2y/2x^+2xy
先化简,再求值:(3x-y)^2-5x(x-y),其中x=0.2,y=0.1 , (2a+b)(2a-b)-3(2a-b
几道因式分解..4ab(a+b)^2-6a^2b(a+b)(x+y)^2(x-y)+(x+y)(x-y)^22a(a-3
x-3=5-y,a和b互为倒数,则代数式2分之一(x+y)+5ab=?
已知:A=X*X-3xy+y*y,B=2x*x+xy-3y*3y.求A+B,A-B,A+2B