既是2的倍数又是5的倍数还是3的倍数的数是( )。A.30B.22C.15
50里有几个10?( )A.6 B.7 C.5
70里有几个10?( )A.6 B.7 C.8
20×3的结果是( )A.30 B.50 C.60
10×8的结果是( )A.80 B.100 C.60
10×6的结果是( )A.80 B.100 C.60