三年级数学两位数乘两位数ppt课件.ppt
, , , ( ) 3020 = 4020 = 5080=, :,2. 12 ( ) 28 ( ) 35 100 ( ) 700 ( ) ,600,800,4000,120,280,3500,70, 300 60 . 10 30 ,300 30010 103000,30 010=, :10 3000 。,3000,(), : 8030=,80,30,2400, 3 0 60 1 6 0 50 50 5015 0 0 30 0 8 0,( ),( ),( ),2) 03=60(。2030= 600 20300= 6000 203000=60000, 233( )2303 3706( )3076 5489( )5501, !,