解方程组 x+y=2z,x-y=1/3z,x+y+z=18
人气：378 ℃ 时间：2020-06-13 15:36:12
解答
x+y=2z...(1)x-y=1/3z...(2)x+y+z=18...(3)(1)带入（3）2z+z =183z=18z=6分别带入（1）、（2）x+y =2*6 =12...(4)x-y =1/3*6 =2...(5)(4)+(5)2x =12+2 =14x =7带入（4）7+y =12y=5所以,x=7,y=5,z=6....
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