9x+4y+z=10 ①
-9x+2y+3z=-6 ②
3x-4y+2z=5 ③
①+②得 6y+4z=4,即3y+2z=2 ④
②+3×③得 -10y+9z=9 ⑤
④×10+⑤×3得 47z=47
∴z=1
∴y=0
∴x=1
9x+4y+z=10 {-9x+2y+3z=-6 3x-4y+2z=5
9x+4y+z=10 {-9x+2y+3z=-6 3x-4y+2z=5
数学人气:285 ℃时间:2019-10-09 10:14:26
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