用简便方法计算.
79+82+18???????????????????????
46+(128+354)
4×48×5????????????????????????
5×(8×13)
网友回答
解:(1)79+82+18???
=79+(82+18),
=79+100,
=179;
(2)46+(128+354)
=46+354+128,
=400+128,
=528;
(3)4×48×5?
=4×5×48,
=20+48,
=68;
(4)5×(8×13)
=5×8×13,
=40×13,
=520.
解析分析:(1)可根据加法结合律计算;
(2)可根据加法结合律及交换律计算;
(3)可根据乘法交换律计算;
(4)可根据乘法结合律计算.
点评:本题考查了学生根据运算定律完成简单的整数四则混合运算的能力.