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Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 已解決 |
Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 已解決 |
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國一數學,請詳解,急!!!!!
Jun 24th 2013, 14:31
(1) f(1) : F(3) = 2 : 1 [a(1) + b] : [a(3) + b] = 2 : 1 (a + b) : (3a + b) = 2 : 1 1(a + b) = 2(3a + b) a + b = 6a + 2b b = -5a b/a = -5
(2) 時間 = 距離/速度 從甲地到乙地需時 = 360 / x 小時 從乙地回甲地需時 = 360 / y 小時 (360 / x) + (360 / y) = 4 360[(1 / x) + (1 / y)] = 4 (1 / x) + (1 / y) = 1 / 90 1 / y = (1 / 90) - (1 / x) 1 / y = (x / 90x) - (90 / 90x) 1 / y = (x - 90) / 90x y = 90x / (x - 90)
(3) A - B = (1 - 5x) - (3x + 7) = 1 - 5x - 3x - 7 = -8x - 6 已知: -2 < x ≤ 4 -4 ≤ -x < 2 8(-4) ≤ 8(-x) < 8(2) -32 ≤ -8x < 16 (-32 - 6) ≤ (-8x - 6) < (16 - 6) -38 ≤ (A - B) < 10
參考資料 wanszeto
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