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题型:综合题 题类:常考题 难易度:普通

西师大版数学四年级下学期 2.2 乘法运算律及简便运算(5)

根据运算定律填空。                                                                              
(1)、(53+17)×3=×+×                                                        
(2)、18×54+18×46=(+)×                                                                 
(3)、82×99+82=(+)×82                                                         
(4)、36×99=×(-)                                                           
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