一3x+2y=-23x-y=4二x/3-y/4=1x/2+y/3=2三2a+b=32b+a=7
二元一次方程组的解一{a=2b+3}a=3b+20二 {x-y=4}4x+2y=-1三 {5x-y=110}9y-x=1
已知集合A={(x,y)| (y-3)/ (x-1)=2,x,y∈R},B={(x,y)| 4x+ay=16,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
1.设A={(x,y)/4x+y=6} B={(x,y)/3x+2y=7} 则A∩B等于多少
3a(x+y)-2b(x+y)=(x+y)(?)
1.已知集合A={(x,y)|y=2x+1},B={(x,y)|y=x+3},a∈A,b∈B,求a
设A={(x,y)|y=-2x+3,x,y∈R},B={(x,y)|y=(4-3m^2)x+1,x,y∈R},求A∩B≠
高二数学题难死了集合A={(x,y)丨y=-x^2+mx-1},B={(x,y)丨y=3-x,0
已知3x+2y=a,2x+3y=b,则(x+y)(x-y)=?
已知:A=X*X-3xy+y*y,B=2x*x+xy-3y*3y.求A+B,A-B,A+2B
如果分式3x-6y/x+y=0,那么x,y 应满足 A、x=2y B、x≠-y C、x=2y且x≠-y D、x=2y且y
已知集合A={Y|Y=X^2-4X+3},B={Y|Y=-X^2-2X+2}则A∩B=