跟中文教材一樣，第一課必定是命題。原命題，逆命題，否命題，逆否命題。原命題：如果You eat spinach,則You will get st...
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【Khan】邏輯推理 -
Pre-algebraKHan Academy APP里關于數學的課程還真是面兒廣，從估計幼兒園水平的Early math，一直到大學一年級的Calculus. 從哪...
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