[解題] 國中理化 電費的計算
1.年級:國三
2.科目:理化
3.章節:電與生活
4.題目:電費的計算方式,例如100度以下2元,100~300度2.5元
則用電250度時應付多少錢?
5.想法:我一直以為用到那個度數時就全部乘以那個區間的單價
即250*2.5=625元
但答案上的算法是100*2+150*2.5=575元
不知哪一種才正確呢?
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