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解x+y=z,7y=x+z+2,x+y+z=14
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解x+y=z,7y=x+z+2,x+y+z=14
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答案和解析
1式代入3式,可得z=7.将z=7代入1,2式,x+y=7和7y=x+9联立,消元后,x=5,y=2.
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