ï¼ ï¼+ï¼ ï¼=8
+ +
ï¼ ï¼âï¼ ï¼=6
|| ||
13 8
设ï¼x+y=8,z-w=6,x +z=13,y +w=8
åï¼
x+y=8ï¼1ï¼
x+z=13ï¼2ï¼
z-w=6ï¼3ï¼
y+w=8ï¼4ï¼
ï¼4ï¼+ï¼3ï¼:
y+z=14(5)
(2)-(1):
-y+z=5(6)
(5)+(6):
2z=19
z=9.5
y=4.5
x=8-y=3.5
9.5-w=6
w=3.5
å æ¤åæ¹ç¨ç»è§£ï¼
x=3.5
y=4.5
z=9.5
w=3.5
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