x+y+z=110 x=y+z-8 y=z+13 用三元一次方程组解..步骤都要..不要漏步骤
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![x+y+z=110 x=y+z-8 y=z+13 用三元一次方程组解..步骤都要..不要漏步骤](/uploads/image/z/6915086-62-6.jpg?t=x%2By%2Bz%3D110+x%3Dy%2Bz-8+y%3Dz%2B13+%E7%94%A8%E4%B8%89%E5%85%83%E4%B8%80%E6%AC%A1%E6%96%B9%E7%A8%8B%E7%BB%84%E8%A7%A3..%E6%AD%A5%E9%AA%A4%E9%83%BD%E8%A6%81..%E4%B8%8D%E8%A6%81%E6%BC%8F%E6%AD%A5%E9%AA%A4)
x+y+z=110 x=y+z-8 y=z+13 用三元一次方程组解..步骤都要..不要漏步骤
x+y+z=110 x=y+z-8 y=z+13 用三元一次方程组解..步骤都要..不要漏步骤
x+y+z=110 x=y+z-8 y=z+13 用三元一次方程组解..步骤都要..不要漏步骤
x+y+z=110(1)
x=y+z-8(2)
y=z+13(3)
(3)带入(2)得:x=z+13+z-8=2z+5;(4)
(3)、(4)带入(1)得:2z+5+z+13+z=110;
4z+18=110;
4z=92;
z=23;
带入(3)得:y=Z+13=23+13=36;
带入(4)得:x=2×23+5=51;
∴x=51,y=36;z=23;
如果本题有什么不明白可以追问,
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