1,9(2a+3b)^2-4(3a-2b)^2 2,已知x+3y=0,求x^3+3x^2y-2x-6y的值
已知:6x²-7xy-3y²+14x+y+a=(2x-3y+b)(3x+y+1)求a,b的值
已知|x-y-3|+(a+b+4)²=0,求2a+2b-(a+b)分之(x-y)²-3(y-x)的值
1.已知集合A={(x,y)|y=2x+1},B={(x,y)|y=x+3},a∈A,b∈B,求a
已知A=2x-4y,B=-2x的2次方+6x-3{y-x},求:{1}2A-B{2}3A-B
已知:A=X*X-3xy+y*y,B=2x*x+xy-3y*3y.求A+B,A-B,A+2B
因式分解 (1)6(x-y)^3-3y(y-x)^2 (2)x(x-y)(a-b)-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
已知集合A={(x,y)|2x+3y=6},B={(x,y)|x-2y=-4},求A∩B,
已知集合A={(x,y)| (y-3)/ (x-1)=2,x,y∈R},B={(x,y)| 4x+ay=16,x,y∈
已知A=2x^+2X-3Y^ B=4X^-Y-6Y^ 2A-B=2a |X-a|+(Y-2)^=0 求A的值
(2x+y)(2x-3y)+x(2y+y) 2a(x-y)-4b(x-y)
已知(-2x^2y^2)(4x^ay^3)(-3x^5y^b)=24x^10y^8,求2a+3b的值