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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