maths急!!!

👨🏻‍🏫 學術台數學

[匿名]

2011-11-01 4:40 am

x+y=83 急!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

更新1:

x+y=83 . z+x=138 . y+z=121 . find x+y+z !!! 急!!!.

更新2:

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回答 (6)

TwoThounsands

2011-11-01 4:43 am

✔ 最佳答案

x+y=83

y = - x + 83

2011-10-31 21:09:01 補充：
x+y=83 . z+x=138 . y+z=121 .

x+y+z
=83+z
=83+(121-y+138-x)/2
=83+(121-83+138)/2
=171

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william

2011-11-01 8:32 pm

x + y = 83
z + x = 138
+) y + z = 121
------------------------
2(x+y+z) = 342
x+y+z = 171

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知識就是力量

2011-11-01 5:30 am

Fastest method:
x + y = 83, z + x = 138, y + z = 121
(x+y) + (z+x) + (y+z) = 83 + 138 + 121
2x + 2y + 2z = 342
x + y + z = 171

2011-10-31 21:30:55 補充：
The above method does not require solving any unknown x,y or z.

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[匿名]

2011-11-01 5:28 am

x+y=83
y+z=121
so,x+y+y+z=204
x+2y+z=204
138+2y=204
2y=204-138
y=66
cuz,x+z=138
y=66
x+z+y=138+66
=171
x+y+z=171

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[匿名]

2011-11-01 5:07 am

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用戶23023

2011-11-01 4:43 am

no other information???
How can i answer u???

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收錄日期: 2021-04-27 16:37:33
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