问题 解答题
计算
5×16×8
(7+21)×5(35+5)×61680×5.
答案

(1)5×16×8,

=80×8,

=640;

(2)(7+21)×5,

=28×5,

=140;

(3)(35+5)×6,

=40×6,

=240;

(4)1680×5=8400.

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