6x+3y=10 2x-4y=-5

(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuai 已知X,Y,满足(X+3Y)(X-3Y)=-10(Y^2-6/5)和2X(Y-1)+4(1/2X-1)=0 {3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1 x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20 {(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20 4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6 6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5 3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27 2X+Y+Z=10,X+2Y+Z=-6,X+Y+2Z=8 5X+4Y-3Y=13,2X-3Y+7Z=19,3X-Y=2X 4x-2y-6y*-y-3x+5y* *=2 就是平方 若5x+3y=3x+4y=x+2y+6,则x+y=___ 已知x,y满足约束条件{2x+5y>=10,2x-3y>=-6,2x+y