(x-y+m-n)^2=x^2-y^2+m^2-n^2

(x+y)(m+n)2-(x+y)(m+n)2 计算一,y-x分之x+y 加x-y分之y剪y-x分之2x-y= 二n-m分之m+2n加n-m分之n剪n-m分之2n=__ (x-y+m-n)^2=x^2-y^2+m^2-n^2 对于集合M,N,定义M-N={x|x属于M且X不属于N},定义M*N=(M-N)∪(N-M),设M={y|y=x^2,x 信号与系统中 y(n)=x(n)+x(n+1)如果|x(n)|≤M, 则|y(n)|≤|x(n)|+|x(n+1)|≤2 把下列各式因式分解(2m+3n)(2m-n)-4n(2m-n)(x+y)^2(x-y)+(x+y)(y-x)^24a(x 计算：1.[(m+n)(n-m)-(m+n)^2+3m(m+n)]除以（-2M),其中m=-4,n=2 2.(x+y)( 已知,单项式M,N满足2x(M+3x)=6x^2y^2+N,求M,N. 已知单项式M、N满足2x(M+3x)=6x^2y^2+N,求M、N. 集合M={X=3m+1,m∈N*},N={y/y=5n+2,n∈N*},则M∩N=? 已知,单项式M,N满足2x（M+3x)=6x²y²+N,求M,N 已知单项式M,N满足3x(M-5x)=6x^2y^3+N,求M,N