问题 解答题
动脑筋,用简便方法计算.
185+198
195+68+3231×4×532×25.
答案

(1)185+198

=185+200-2

=385-2

=383;

(2)195+68+32

=195+(68+32)

=195+100

=295;

(3)31×4×5

=31×(4×5)

=31×20

=620;

(4)32×25

=8×(4×25)

=8×100

=800.

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