计算下面各题,能用简便方法的就用简便方法计算.(1)15.52-1.6×5-5.7????????????(2)9.83×1.5+6.17×1.5(3)19.8-0

发布时间:2020-08-04 14:41:20

计算下面各题,能用简便方法的就用简便方法计算.
(1)15.52-1.6×5-5.7???????????? (2)9.83×1.5+6.17×1.5
(3)19.8-0.6×0.6-0.64??????????(4)0.125×7.9×8
(5)63×10.1??????????????????? (6)21.5÷[(6.07+2.53)×0.5].

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解:(1)15.52-1.6×5-5.7,
=15.52-8-5.7,
=7.52-5.7,
=1.82;
(2)9.83×1.5+6.17×1.5,
=1.5×(9.83+6.17),
=1.5×16,
=1.5×2×8,
=24;
(3)19.8-0.6×0.6-0.64,
=19.8-0.36-0.64,
=19.8-(0.36+0.64),
=19.8-1,
=18.8;
(4)0.125×7.9×8,
=0.125×8×7.9,
=1×7.9,
=7.9;
(5)63×10.1,
=63×(10+0.1),
=63×10+63×0.1,
=630+6.3,
=636.3;
(6)21.5÷[(6.07+2.53)×0.5],
=21.5÷[8.6×0.5],
=21.5÷[0.5×2×4.3]
=21.5÷4.3,
=5.
解析分析:第(3)题运用了减法的性质,第(2)、(5)运用了乘法的分配律,第(4)、(6)运用了乘法的结合律去计算.

点评:在第(2)、(3)、(6)小题的计算的过程中间又运用了简便计算,有的一题用了两次简便计算.
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