1.x+y=16,y+z=12,z+x=102.3x-y+z=4,2x+3y-z=12,x+y+z=63.x+y+z=6
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1.x+y=16,
y+z=12,
z+x=10
2.3x-y+z=4,
2x+3y-z=12,
x+y+z=6
3.x+y+z=6,
y:z=2:3,
3x-z=0
二.已知4x-3y-6m=0,
x+2y-7m=0.
求 x-y+m分之x+y+m的值
三.在等式y=ax²+bx+c中,当x=-1时,y=4;当x=2时,y=7;当x=5时,y=46.试求x=6时,y的值.
一定马上就要,
y+z=12,
z+x=10
2.3x-y+z=4,
2x+3y-z=12,
x+y+z=6
3.x+y+z=6,
y:z=2:3,
3x-z=0
二.已知4x-3y-6m=0,
x+2y-7m=0.
求 x-y+m分之x+y+m的值
三.在等式y=ax²+bx+c中,当x=-1时,y=4;当x=2时,y=7;当x=5时,y=46.试求x=6时,y的值.
一定马上就要,
1.x+y=16①
y+z=12②
z+x=10③
①-②x-z=4④
③+④2x=14
x=7⑤
⑤代入①
y=9⑥
⑥代入②z=3
x=7,y=9,z=3
(2)3x-y+z=4①
2x+3y-z=12②
x+y+z=6③
①+③
5x+2y=16④
②+③
3x+4y=18⑤
④⑤得
x=2,y=3
代入①z=1
x=2,y=3,z=1
二
4x-3y-6m=0,①
x+2y-7m=0 ②
得x=3m,y=2m
所以( x-y+m)/(x+y+m)
=2m/6m
1/3
三a-b+c=4①
4a+2b+c=7②
25a+5b+c=46③
a=2,b=-1 ,c=1
x=6
y=2(6²)-6+1
=67
y+z=12②
z+x=10③
①-②x-z=4④
③+④2x=14
x=7⑤
⑤代入①
y=9⑥
⑥代入②z=3
x=7,y=9,z=3
(2)3x-y+z=4①
2x+3y-z=12②
x+y+z=6③
①+③
5x+2y=16④
②+③
3x+4y=18⑤
④⑤得
x=2,y=3
代入①z=1
x=2,y=3,z=1
二
4x-3y-6m=0,①
x+2y-7m=0 ②
得x=3m,y=2m
所以( x-y+m)/(x+y+m)
=2m/6m
1/3
三a-b+c=4①
4a+2b+c=7②
25a+5b+c=46③
a=2,b=-1 ,c=1
x=6
y=2(6²)-6+1
=67
1.x+y=16,y+z=12,z+x=102.3x-y+z=4,2x+3y-z=12,x+y+z=63.x+y+z=6
(x+y-z)(x-y+z)=
X+Y+Z=?
试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y)
x=y/z=z/3,x+y+z =12,求2x+3y+4z是多少,
解方程组{x(x+y+z)=6,y(x+y+z)=12,z(x+y+z)=18
如果|x+y+z-6|+|2x+3y-z-12|+|2x-y-z|=0求x,y,
f(x,y,z,w)=x*(x+y)*(x+y+z)*(x+y+z+w)
解方程组{3x+y-z=4,2x-y+3z=12,x+y+z=6}
解方程{3x -y+z=4 2x+3y-z=12 x+y+z=6
x/2=y/3=z/5 x+3y-z/x-3y+z
1.设有比例式:x/(y+z)=y/(x+z)=z/(x+y),有比例性质,得x/(y+z)=y/(x+z)=z/(x+