6.12+3.78=
16×30%=
1.2+0.2×0.3=
0.25×2021×4=
⑴2,4,6,8,10。( )
⑵1,3,5,7,9。( )
⑶2,5,8,11,14。( )
⑷5,7,9,11,13。( )