(1)x+y+z=1 (2)x:y=4:5 (3) 2x+3y=16 (4)6x=5y 2x+3y+2z=2 y:z=2:3 x+4y=13 400+4x=4yx+5y+19z=4 x+y+z=33

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(1)x+y+z=1(2)x:y=4:5(3)2x+3y=16(4)6x=5y2x+3y+2z=2y:z=2:3x+4y=13400+4x=4yx+5y+19z=4x+y+z=33(1)x+y+z=1

(1)x+y+z=1 (2)x:y=4:5 (3) 2x+3y=16 (4)6x=5y 2x+3y+2z=2 y:z=2:3 x+4y=13 400+4x=4yx+5y+19z=4 x+y+z=33
(1)x+y+z=1 (2)x:y=4:5 (3) 2x+3y=16 (4)6x=5y
2x+3y+2z=2 y:z=2:3 x+4y=13 400+4x=4y
x+5y+19z=4 x+y+z=33

(1)x+y+z=1 (2)x:y=4:5 (3) 2x+3y=16 (4)6x=5y 2x+3y+2z=2 y:z=2:3 x+4y=13 400+4x=4yx+5y+19z=4 x+y+z=33
(1)把第一个式子乘以2与第二个式子作差,得y=0,把第三个式子和第一个作差,得4y+18z=3,z=1/6,最后把x,y带到任意式子中,得x=5/6;(2)用y来表示x和z,由第一个和第二个式子得x=4y/5,z=3y/2,带到第三个式子中得y=10,从而得到x=8,z=15;(3)把第二个式子乘以2与第一个式子作差,得y=2,把y=2带入任意式子,得x=5；（3）由一式得x=5y/6,带入二式得400+10y/3=4y,y=600,所以x=5y/6=500.这些题通过把式子进行简单的加减运算便可得出结果,注意消元,认准要消去什么求什么,下次要自己动手算咯,

已知 x/(y+z)+y/(z+x)+z/(x+y)=1求 (x*x)/(y+z)+(y*y)/(x+z)+(z*z)/(x+y)=? x-z=-4 z-2y=-1 x+y-z=-1 怎么解 2|X-Y|+√2Y+Z+Z²-Z+1/4=0求X+Y+Z的值 x:y=3:4 y:z=2:1 x+y+z=20 急! 已知实数x y z满足x/(x+1)=y/(y+2)=z/(z+3)=(x+y+z)/3,求x+y+z的值已知实数x y z满足x/(x+1)=y/(y+2)=z/(z+3)=(x+y+z)/3,求x+y+z的值 {x+2y+z=4,x+y+2z=-1,2x+y+z=1 x+y+z=2 4x+2y+z=4 2x+3y+z=1 5x+y+z=1 2x-y+2z=1 x+5y-z=4 x-y-z=1 2x+y-3z=4 3x-2y-z=-1 4x+y+z=-3 2x+3y-4z=-10 x+2y-z=-1 3x-y+2z=-1 4x+y+z=5 x-2y-z=-2 已知x,y,z满足 2倍(x-y的绝对值)+(2y的平方根)-z+(z×z)=-1/4,求x,y,z的值 x-y+z=-1 5x+2y-z=6 4x-3y+2z=-5 x+y-z=6 x-3y+2z=1 3x+2y-z=4 阿 x+y+z=-1 4x-2y+3z=5 y-z=8-2x x+y-z=6,x-3y+2z=1,3x+2y-z=4 x+y+z=-5,3x+y+z=1,4x+3y+2z=-2快