[計量] 印度機經請教
和各位討論一下解法
l m
| / /
| / P /
| / / 我劃不出圖 l 和 m 通過原點 p在兩條線之間
| / /
| / /______________
If equation of the line ‘l’ is x = y and ‘m’ is x = 2y, then what is the
value of P?
(3, 5)
(6, 2)
& so on…..
斜率 l = 1 1 > mp > 1/2 看起來(3,5)比較合理
m = 1/2
If a, b and c are 0, 1 or 2 and if a.9 + b.3 + c = 25, then what is the
possible value of a + b + c?
a + b + c = 25 -8a -2b
a = 0 b = 1 a + b + c = 23
b = 2 a + b + c = 21
a = 1 b = 0 a + b + c = 17
b = 2 a + b + c = 13
a = 2 b = 0 a + b + c = 9
b = 1 a + b + c = 7
選項當中有上面的答案就是解 ?? 不曉得對不對
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