铭记在心
幼苗
共回答了21个问题采纳率:85.7% 举报
1) x+y+z=26---(1)
x-y=1---(2)
2x-y+z=18---(3)
(1)+(2)==>2X+Z=27---(4)
(1)+(3)==>3X+2Z=44---(5)
(4)*2-(5)==>X=10,Z=7,Y=9
2) 5x+y+z=1--(1)
2x-y+2z=1---(2)
x+5y-z=4----(3)
(1)+(2)==>7X+3Z=2---(4)
(1)*5-(3)==>24X+6Z=1---(5)
(4)*2-(5)==>-10X=3,
X=-3/10,Z=41/30,Y=17/15
1年前
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