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解方程组x+y=5 y+z=6 x+z=7
人气:333 ℃ 时间:2020-01-09 20:49:57
解答
x+y=5 (1)
y+z=6 (2)
x+z=7(3)
(1)+(2)+(3)
2(x+y+z)=18
x+y+z=9 (4)
(4)-(1),z=4
(4)-(2),x=3
(4)-(3),y=2
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