小學(xué)二年級奧數(shù)題:填入適當(dāng)?shù)臄?shù)

字號:

請在( )中填上適當(dāng)?shù)臄?shù):
    3,6,9,12,( ),18,21,24,27
    答案與解:15,因為后面的數(shù)和前面的數(shù)都是相差3,所以12+3=15