化简 4y×5= 5a+3+3a= m÷2+m÷5= 3x+3y-8y+x= 6x×7y= （3n+3m）÷3=

化简 4y×5= 5a+3+3a= m÷2+m÷5= 3x+3y-8y+x= 6x×7y= （3n+3m）÷3= 计算[(x-y)^3]^m[(x-y)^m]^5=. 若[-3(x+y)^m*(x-y)^2n]^2*[-(x+y)^2]=-a(x+y)^10*(x-y)^12-n,求m, 3x+4y=-5 5x+6y=-9 (n-8m)x-8y=10 5x+(10m+2n)y=-9 求m.m+n.n=? 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 (1)x-3y=2,y=x;(2)x+y=52x+y=8(3)4x+3y=5,x-2y=4;(4)m-n/2=22m+3 已知单项式M,N满足3x(M-5x)=6x^2y^3+N,求M,N 下列各式添括号正确的是：( ) A.-x+y=-(y-x) B.x-y=-(x+y) C.10-m=5(2-m) D.3 已知关于x,y的方程组{(n-8m)x-8y=10,5x+(10m+2n)y=-9和{3x+4y=-5,5x+6y=-9 解关于x,y的二元方程组：3x+4y=-5 5x+6y=-9 (n-8m)x-8y=10 5x+(10m+2n)y=-9 已知X、Y满足2X-7Y=3M,X+2Y=4m+5,且X+Y=0,求M的值 已知x,y满足2x-7y=3m,x+2y=4m+5,且x+y=o,求m的值