若12345678的平方-2345678的平方=k,則k是幾位數?
回答 (2)
Sol
12345678^2-2345678^2
=(12345678-2345678)*(12345678+2345678)
=10000000*14691356
=146913560000000
15位數
15次方,12345678平=152415765279684,-2345678=152415762934006
收錄日期: 2021-04-30 22:41:01
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