问题 解答题

计算.

15×(38+46)÷21

640÷[(14+6)×16]

(380-240÷20)÷23.

答案

(1)15×(38+46)÷21,

=15×84÷21,

=15×4,

=60;

(2)640÷[(14+6)×16],

=640÷[20×16],

=640÷320,

=2;

(3)(380-240÷20)÷23,

=(380-12)÷23,

=368÷23,

=16.

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