已知A=2x-3y+1,B=3x+2y,求2A-B
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=X*X-3xy+y*y,B=2x*x+xy-3y*3y.求A+B,A-B,A+2B
1)已知4X=5y,求(X+y):y 2)已知(a-b):(a+b)=3:7,求a:b
已知:6x²-7xy-3y²+14x+y+a=(2x-3y+b)(3x+y+1)求a,b的值
已知A=2x-4y,B=-2x的2次方+6x-3{y-x},求:{1}2A-B{2}3A-B
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)|3x-7y=-5},B={(x,y)|2x+9y=40},求A∩B(用列举
已知集合A=〖(x,y)/2x-y=0〗,B=〖(x,y)/3x+y=0〗,求A交B
已知A={y|y=X^2+2X-7},B={X|y=√3-X},求A交于B,B并于CRA
已知集合A={(x,y)|y=x2-2x-3,x,y∈R},B={(x,y)|y+3/x-2=1,x,y∈R}求A交B
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