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29. 若-3<x<2,且-6<y<5,則 2x+3y 的範圍為下列何者?(A)-19<2x+3y<24 (B)-24<2x+3y<19 (C) -14<2x+3y<9 (D) -9<2x+3y<7。
問題詳情
29. 若-3<x<2,且-6<y<5,則 2x+3y 的範圍為下列何者?
(A)-19<2x+3y<24
(B)-24<2x+3y<19
(C) -14<2x+3y<9
(D) -9<2x+3y<7。
參考答案
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-3<x<2,且-6<y<5,則 2x+3☆-6<2...
上一篇 :
28. 已知 f ( x )+g ( x )=7x+4,f ( x )-g ( x )=-3x+18,則 f ( 3 )=?(A)15 (B)17 (C)19 (D)21
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30. 某段路橋全長 10 公里,有一輛摩托車以每小時 30 公里到 50 公里之間的速率通過該路橋。下列何者可能是該車通過路橋所花的時間?(A) 7 分鐘 (B) 9 分鐘 (C) 11 分鐘 (D
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