计算下面各题,能简算的要简算,并写出简算过程. (1)179+54+321 (2)13×14×125×2 (3)
计算下面各题,能简算的要简算,并写出简算过程.(1)179+54+321(2)13×14×125×2(3)15.25-3.1+0.75-4.9(4)115×23-23×1...
计算下面各题,能简算的要简算,并写出简算过程. (1)179+54+321 (2)13×14×125×2 (3)15.25-3.1+0.75-4.9 (4)115×23-23×15 (5)124×5+169÷13 (6)40-(15.3-4.8)
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(1)179+54+321,
=179+321+54,
=500+54,
=554;
(2)13×14×125×2,
=(13×14)×(125×2),
=182×250,
=45500;
(3)15.25-3.1+0.75-4.9,
=(15.25+0.75)-(3.1+4.9),
=16-8,
=8;
(4)115×23-23×15,
=(115-15)×23,
=100×23,
=2300;
(5)124×5+169÷13,
=620+13,
=633;
(6)40-(15.3-4.8),
=40-10.5,
=29.5.
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