解方程:x+y=6 ①,3x-3y=6 ②
{3x-4y=10 ①5x+6y=12②解方程
用代入法解方程2(x-y)/3-(x+y)/4=-1① 6(x+y)-4(2x-y)=16②
解方程{①2x-y+z=6②-3x+2y-z=-9③x+y-2y=-1
解方程:①2x+y+z=2②x-3y-5z=6③3x+2y=0
解方程:x+y+z=0 ① 4x+2y+z=3 ② 9x+3y+z=6 ③
解方程x/2+y/3=2-x 2x/3-y/6=y/3+17/6
解方程{3x -y+z=4 2x+3y-z=12 x+y+z=6
解方程:x-x-1/2=2-x+2/3 y+6=y+2/2-y-5/3
解方程:3x+2y/4=2x+y/5=x-y+1/6要详细过程
解方程一;{x+y-z=6,x-3y+2z=1,3x+2y-z=-7.②{3x+4z=7,2x+3y+z=9,5x-9y
求方程x+2y-3x=4,3x-2y+x=6,3x+2y-5x=8的解
设实数x、y满足方程2x²+3y²=6y,求x+y的最大值