a+2a= 8b-b= y+9y= x+7x-4x=
a+2a= 8b-b= y+9y= x+7x-4x=
(x-A)*(B-y)=x^2-9xy+8y^2,求A,B
1、A={(x,y)|y=x平方-4x=5},B={(x,y)|y=2x平方-7},求A交B
已知集合A={(x,y)|3x-7y=-5},B={(x,y)|2x+9y=40},求A∩B(用列举
1.设A={(x,y)/4x+y=6} B={(x,y)/3x+2y=7} 则A∩B等于多少
已知:A=X*X-3xy+y*y,B=2x*x+xy-3y*3y.求A+B,A-B,A+2B
X=a*b*c,Y=a*b*c,[X,Y]=( ),(x.y)=( ).
已知集合A={(x,y)|(y-2)/(x-1)=a+2,x,y∈R},B={(x,y)|(a²-4)x+(a
x²(x+y)(y-x)-xy(x+y)(x-y) 已知a+b=4,ab=-2,求多项式3a²b+3
define A(x,y) x*y-x/y main(){int a=5,b=2,y;y=A(a+b,a-b);prin
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^x-y*a^2y+1=a^11,且b^x-1*b^4-y=b^5,求(x^2)*y的值