问题 解答题

计算,能使用简便方法吗?

27×12-286÷13

(339-67)×15÷24

25×294×4

4000÷125÷8

18×45+18×55

2.39+14.4+0.61.

答案

(1)27×12-286÷13,

=324-22,

=302;

(2)(339-67)×15÷24,

=272×

5
8

=170;

(3)25×294×4,

=(25×4)×294,

=100×294,

=29400;

(4)4000÷125÷8,

=4000÷(125×8),

=4000÷1000,

=4;

(5)18×45+18×55,

=(45+55)×18,

=100×18,

=1800;

(6)2.39+14.4+0.61

=2.39+0.61+14.4,

=3+14.4,

=17.4.

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