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数学7上整式规律题：求解前2017个图形火柴总数是2017的倍数？
下列是用火柴棒拼出的一列图形． 仔细观察，找出规律，解答下列各题： ⑴第4个图中共有_________根火柴，第6个图中共有_________根火柴； ⑵第n个图形中共有_________根火柴(用含n的式子表示) ⑶若f(n)=2n−1（如f(−2)=2×(−2)−1，f(3
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