( ),( ),21,( ),35.找规律,
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( ),( ),21,( ),35.找规律,
( ),( ),21,( ),35.找规律,
( ),( ),21,( ),35.找规律,
7 14 21 28 35
等差数列:7,14,21,28,35
7 14 21 28 35? 7的倍数?
( ),( ),21,( ),35.找规律,
( ),( ),21,( ),35.找规律,
( ),( ),21,( ),35.找规律,
7 14 21 28 35
等差数列:7,14,21,28,35
7 14 21 28 35? 7的倍数?