题目内容

2.下面各题,怎样算简便就怎样算.
480÷2÷5             6300÷7÷9           350÷(7×2)69+69×99
540÷36              (8+40)×25           355+260+140+245         102×99
                                
                                  
                                
                                

分析 (1)(2)(3)(5)根据除法的性质简算即可.
(4)(6)(8)根据乘法的分配律简算即可.
(7)根据加法的交换律与结合律简算即可.

解答 解:(1)480÷2÷5
=480÷(2×5)
=480÷10
=48

(2)6300÷7÷9
=6300÷(7×9)
=6300÷63
=100

(3)350÷(7×2)
=350÷7÷2
=50÷2
=25

(4)69+69×99
=69×(99+1)
=69×100
=6900

(5)540÷36
=540÷6÷6
=90÷6
=15

(6)(8+40)×25 
=8×25+40×25 
=200+1000
=1200

(7)355+260+140+245
=(355+245)+(260+140)
=600+400
=1000

(8)102×99
=102×(100-1)
=102×100-102
=10200-102
=10098

点评 完成本题要注意分析式中数据,运用合适的简便方法计算.

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