3x+y=12,x+3y=4:;且m=x+y,n=x-y;则m=?n=?
若[-3(x+y)^m*(x-y)^2n]^2*[-(x+y)^2]=-a(x+y)^10*(x-y)^12-n,求m,
已知M.N分别表示不同的单项式,且3x(M-5x)=6x*x*y*y*y+N,求M,N
若全集I={(x,y)|x,y∈R},集合M={(x,y)|(y-3)/(x-2)},N{(x,y)|y=x=1},则(
设x=/y,x=m*4-m*3n,y=n*3m-n*4,则x与y的大小关系是?
对于集合M、N,定义M-N={x|x∈M,且x∉N},M⊕N=(M-N)∪(N-M).设A={y|y=x2-3x,x∈R
对于集合M,N,定义M-N={x|x∈M且x∉N},M⊕N=(M-N)∪(N-M),设A={y|y=x2-3x,x∈R}
已知M={(x,y)|2x+3y=4320,x,y∈N},N={(x,y)|4x-3y=1,x,y∈N},则( )
选择题:设集合M={(x,y)|2x+3y=8},N={(x,y)|3x+2y=7},则M∩N=
已知集合M={(x,y)|y=x+3},N={(x,y)|y=-2x+6},则M∩N=______.
已知集合M={(x,y)|x,y为实数,且x²/4-y²/9=1},N {(x,y)|x,y为实数,
已知集合m={(x,y)/x平方+2x+y=0},n={(x,y)/y=x+a},且空集是m交n
2x^6n-x^4n×y^3m-y^9m,已知x^2n=3,y^3n=2,求值