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.

判断题
综合