问题 解答题

321+168+79

125×16

(25×17)×4.

答案

(1)321+168+79

=321+79+168

=400+168

=568;

(2)125×16

=125×(8×2)

=125×8×2

=1000×2

=2000;

(3)(25×17)×4

=25×4×14

=100×17

=1700.

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