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二年级第一学期数学,把下列加法算式改写成乘法算式。,101010 =( )( ),666666 =( )( ),333333 3 3 =( )( ),444844 =( )( ),10,3,6,6,3,8,20,5,4,7,8,4,4,3,看图写乘法算式。,这箱可乐一共有几瓶?,每排有6瓶可乐,有这样的4排,4个6,46 =6666 =24瓶,每排有4瓶可乐,有这样的6排,6个4,64 =4444 44=24瓶,46,64,=,25,52,=,5,5,2,2,6,6,4,4,交换两个因数的位置,积不变。,52 = 25 = 5 + 5 = 10(颗),填( ):,44444 =( )( ) =( )( ),888 = ( )( ) = ( )( ),111111 = ( ) ( ) = ( ) ( ),57= ( )( ),29= ( )( ),5( ) = 8( ),( ) ( )= 104,5,4,4,5,3,8,8,3,6,1,1,6,7,5,9,2,4,10,8,5,看图写出两个乘法算式,并计算。,62 = 26 = 66 = 12,6个2 62 =,2个6 26 =,43 = 34 = 444 = 12,3个4 34 =,4个3 43 =,想一想:,456 =( )( ),333369 =( )( ),9,3,二年级第一学期数学,