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乘法交换律,在括号内填上适当的数或符号,1. 11 50 = ( ) 11,2. 30 200 = 200 ( ),3. 60 a = ( ) ( ),= ( ) ( ),50,30,60,a,4.,判断:,1,54 72 = 72 54 ( ),2, 890 120 = 120 980 ( ),3, 160 38 = 38 + 160 ( ),1, 16 ( ) = 127 16,2, ( ) 573 = ( ) 101,3, ( ) 702 = 702 ( ),4, 48 ( ) 81 = 81 ( ) 48,在括号内填上适当的数或符号,127,101,573,1,1,不计算,判断怎样才能算起来简便,5 87 700 542 180 635,140 251 17 234 109 606,怎样简便就怎样算,44 213 302 512,310 2680 635 746,1. 50 243 2,2. 25 125 8 4,你会算吗?,