x+y+z=35 y=2x-5 1/3y=1/2z
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x+y+z=35y=2x-51/3y=1/2zx+y+z=35y=2x-51/3y=1/2zx+y+z=35y=2x-51/3y=1/2z因为1/3y=1/2z两边同时乘以2得Z=3/2Y又因为y=2
x+y+z=35 y=2x-5 1/3y=1/2z
x+y+z=35 y=2x-5 1/3y=1/2z
x+y+z=35 y=2x-5 1/3y=1/2z
因为1/3y=1/2z 两边同时乘以2 得Z=3/2Y
又因为 y=2x-5 把Z=3/2Y 和 y=2x-5
带入到x+y+z=35
就变成X+2X-5+2/3(2X-5)=35
等号两边同时乘以3 就变成
3x+6x-15+4x-10=105
整理得X=10 代入 y=2x-5
得y=15 代入Z=3/2Y
得z=10
懂了吗?
第三个公式得Z=2/3y代入第一个公式:得:x+y+2/3y=35,用这个公式与第二个公式合并,求得x=10.y=15,把y=15 代入第三个公式,z=10.
x+y+z=35
y=2x-5
1/3y=1/2z
z=2/3y=2/3(2x-5)=4/3x-10/3
x+2x-5+4/3x-10/3=35
3x+6x-15+4x-10=105
13x=105+25
x=130/13
x=10
y=2x-5=2*10-5=15
z=35-x-y=35-10-15=10
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x:y=2:3 y:z=4:5 x+y+z=35
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