下面各题能简便的要简便.15-8.13-1.875.14+3.225-6.3023.95+5.36-1.9513.67-(5.45+3.67)4.26+5.48-1

发布时间:2020-07-31 11:00:22

下面各题能简便的要简便. 15-8.13-1.875.14+3.225-6.3023.95+5.36-1.9513.67-(5.45+3.67)4.26+5.48-1.26+4.5214.67+25.91+15.33+4.09.

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解:(1)15-8.13-1.87,
=15-(8.13+1.87),
=15-10,
=5;

(2)5.14+3.225-6.302,
=8.365-6.302,
=2.063;

(3)3.95+5.36-1.95,
=3.95-1.95+5.36,
=2+5.36,
=7.36;

(4)13.67-(5.45+3.67),
=13.67-5.45-3.67,
=13.67-3.67-5.45,
=10-5.45,
=4.55;

(5)4.26+5.48-1.26+4.52,
=(4.52+5.48)+(4.26-1.26),
=10+3;
=13;

(6)14.67+25.91+15.33+4.09,
=(14.67+15.33)+(25.91+4.09),
=30+30,
=60.
解析分析:(1)运用减法的运算定律进行简算;(2)依据加减法的运算顺序计算;(3)运用加减法的运算定律进行简算;(4)先去括号,再运用加减法的运算定律进行简算;(5)运用加减法的运算定律进行简算;(6)运用加法的交换律、结合律进行简算.

点评:此题是考查四则混合运算,要仔细观察算式的特点,灵活运用定律进行简便.
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