x+7y=m+1 2x-y＝4 x+y=2 则2m+1=

x+7y=m+1 2x-y＝4 x+y=2 则2m+1= x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 1、x+2y+z=4x+y+z=102x+3y-z=12、2x-3y+4m=113x+2y+5m=21x+3y+7m=20 设集合m＝{y|y=2^x,x {2X+7y=m+1,3x+4y=m x+2y=2x+y+1=7x-y 求：2x-y? {6(x-y)-7(x+y)=21 {2(x-y)-5(x+y)=-1 {3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1 数学计算填空(5x+y)(5x-y)(5x+y)(-5x+y)(5x+y)(-5x-y)(5x+y)(x-5y)(x ^m+y ^n) （y ^n- x^ m)(x ^m+2y-3x^3)²(x-2y）(______)=4y²-x²(__________)²=m²-2m+1（只需要写一个代数式）(__________+3)²=4x²+(_______) 设M={(x,y)||x|+|y| 填空：1.（1）2m（y-x）^2=（ )(x-y)^2填空：1.（1）2m（y-x）^2=（ )(x-y)^2（2）-2m(y-x)^3=( )(x-y)^3( 3 ) (x+y)(y-x)=-(x+y)( )( 4 ) -m(y-x^2)=m( ) (x-y)(x-2y)+(x-2y)(x-7y),其中X=4,Y=1.5 x+y+2(-x-y+1)=3(1-y-x)-4-(y+x-1),x+y=? 已知/x/=≤1,/y/≤1,设M＝/x+y/+/y+1/+/2y-x-4/,求M最大值和最小值, 已知/x/=≤1,/y/≤1,设M＝/x+y/+/y+1/÷/2y-x-4/,求M最大值和最小值 (x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)= 已知方程组x+2y=2m+7,2x-y=4m-3;且x-3y 已知x,y满足2x-7y=3m,x+2y=4m+5,且x+y=o,求m的值