问题
解答题
用简便方法计算.
79+82+18
46+(128+354)
4×48×5
5×(8×13)
答案
(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.