x+y=15 2x+2*6+4*4+(y-10)*8=44怎么解?

解方程组 10（x-y)=3(x+y)+15 6(x+y)=4(2x-y)+16 x+y=15 2x+2*6+4*4+(y-10)*8=44怎么解? 解方程组 x-y/3-x+y/4=2 x-y/6-x+y/8=3 解方程组X+Y/2=3X-2Y=10+6X+Y/4 (4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuai 4x+6y+2(6-(x+y))=15这道方程怎么解 {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 已知x.x+y.y+8x+6y+25=0,求代数式(x.x-4y.y)/(x.x+4xy+4y.y)-x/(x+2y)的 已知2x-y=10,求[(x²+y²)-(x-y)²+2y(x-y)]/4y