TVET CHNS,Eng,Maths
Senior High
請問這題要怎麼解
9. 如圖是某電信公司的通話費計算方式: 300秒以內只繳基本費
超過300秒之後的費用,與通話時間成線型函數關係,試問:
(1) 手機基本費用為多少元?
(2) 本月小郁使用手機通話1500秒,需繳交多少元?
解答 (1)32元 (2)56元
費用(元) 50 36?
0 300 500
1200
通話時間(秒)
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