2x+4y+3z=9 3x-2y+5z=11 5x-6y+7z=13 这个方程怎么解?
人气：377 ℃ 时间：2019-08-20 02:38:43
解答
(1)+(2)-(3)=>z=7-8y
把z=7-8y代入(1),(2)=>2x-20y=-12
3x-42y=-24
=>x=-1,y=1/2,z=3
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