3x+4y=7 (1)
2x+y+3z=9 (2)
5x+7y-9y=8(3)
(2)×3+(3)
11x+10y=35(4)
3x+4y=7(1)
(1)×11-(4)×3
44y-30y=77-105
14y=-28
y=-2代入(1)
3x-8=7
3x=15
x=5
代入(2)
10-2+3z=9
3z=1
z=1/3
所以
x=5
y=-2
z=1/3
3x+4y=7 2x+y+3z=9 5x+7y-9y=8
3x+4y=7 2x+y+3z=9 5x+7y-9y=8
其他人气:488 ℃时间:2020-01-15 19:45:56
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