x+y=5,y+z=9,z+u=10,u-x=6,解这个方程组,急要,
1个回答
x+y=5,①
y+z=9,②
z+u=10,③
u-x=6④
①+④得:y+u=11 ⑤
⑤-②得:u-z=2 ⑥
⑥+③得:u=6,z=4
则x=0,y=5
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