题目内容
10.64+7.65×2.4+11.76
12.75÷[14.6-(1.3+8.2)]
9.83×1.5+6.17×1.5
15.4÷[8×(6.34-4.59)].
12.75÷[14.6-(1.3+8.2)]
9.83×1.5+6.17×1.5
15.4÷[8×(6.34-4.59)].
分析:第(3)题:可以利用乘法的分配律计算;其它三道题按照小数四则混合运算去计算,即先算乘除后算加减,有括号的先算括号里的.
解答:解:(1)10.64+7.65×2.4+11.76,
=10.64+18.36+11.76,
=29+11.76,
=40.76;
(2)12.75÷[14.6-(1.3+8.2)],
=12.75÷[14.6-9.5],
=12.75÷5.1,
=2.5;
(3)9.83×1.5+6.17×1.5,
=1.5×(9.83+6.17),
=1.5×16,
=24;
(4)15.4÷[8×(6.34-4.59)],
=15.4÷[8×1.75],
=15.4÷14,
=1.1.
=10.64+18.36+11.76,
=29+11.76,
=40.76;
(2)12.75÷[14.6-(1.3+8.2)],
=12.75÷[14.6-9.5],
=12.75÷5.1,
=2.5;
(3)9.83×1.5+6.17×1.5,
=1.5×(9.83+6.17),
=1.5×16,
=24;
(4)15.4÷[8×(6.34-4.59)],
=15.4÷[8×1.75],
=15.4÷14,
=1.1.
点评:本题考查了小数四则混合运算的运算顺序,在计算的过程中要注意计算的准确性和灵活的运用运算定律.
练习册系列答案
相关题目