x+y+z=77 x-5=y y=4z
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![x+y+z=77 x-5=y y=4z](/uploads/image/z/3678338-2-8.jpg?t=x%2By%2Bz%3D77+x-5%3Dy+y%3D4z)
x+y+z=77 x-5=y y=4z
x+y+z=77 x-5=y y=4z
x+y+z=77 x-5=y y=4z
将x-5=y 代入x+y+z=77中
所以x+x-5+z=77
2x-5+z=77
2x+z=82
z=82-2x
4z=4(82-2x)=328-8x
因为4z=y x-5=y
所以328-8x=x-5
-9x=-333
x=37
y=37-5=32
z=32/4=8
X等于37,Y等于32,Z等于8
X=37,Y=32,Z=8
(x+y-z)(x-y+z)=
x+y+z=77 y+5=z 4x=z三元一次方程组
X+Y+Z=?
x/y=(x+z)/(y+z)y/z=(x+y)/(x+z)
x+y+z=77 x-5=y y=4z
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(4x-2y-z)-{5x-[8y-2z-(x+y)]-2(3y-10z)}=?好难啊
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