x+y+z=501500x+2100y+2500z=90000x=?y=?z=?请说出算法~

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x+y+z=501500x+2100y+2500z=90000x=?y=?z=?请说出算法~x+y+z=501500x+2100y+2500z=90000x=?y=?z=?请说出算法~x+y+z=50

x+y+z=501500x+2100y+2500z=90000x=?y=?z=?请说出算法~
x+y+z=50
1500x+2100y+2500z=90000
x=?
y=?
z=?
请说出算法~

x+y+z=501500x+2100y+2500z=90000x=?y=?z=?请说出算法~
1500x+2100y+2500z=90000
100(15x+21y+25z)=90000
15x+21y+25z=900
x+y+z=50
15x+15y+15z=750
6y+10z=150
6(y+5/3z)=150
y+5/3z=25
15x+21y+25z=900
x+y+z=50
21x+21y+21z=1050
4x-4z=150
x-z=37.5
15x+21y+25z=900
x+y+z=50
25x+25y+25z=1250
10x+4y=350
2.5x+y=87.5
y+5/3z=25 x-z=37.5 2.5x+y=87.5
(2.5x+y)-(y+5/3z)-(x-z)
=2.5x+y-y-5/3z-x+z
=1.5x-2/3z
=25
1.5x-2/3z=25
87.5-x-y=25+2/3z
25+2/3z+x+y=87.5
2/3z+x+y=62.5
x+y+z=50
-1/3z=12.5
z=-37.5
x=0
y=87.5
算完了,累死我了