题目内容
6-6× | 15÷0.5×2 | (12×)÷3 | 12-12×0.4+0.6 |
×15+6÷ | 21.3-4.17-5.83 | (-)÷+ | -(-)÷. |
解:(1)6-6×,
=6-5,
=1;
(2)15÷0.5×2,
=30×2,
=60;
(3)(12×)÷3,
=9÷3,
=3;
(4)12-12×0.4+0.6,
=12-4.8+0.6,
=7.2+0.6,
=7.8;
(5)×15+6÷,
=×(15+6),
=×21,
=15;
(6)21.3-4.17-5.83,
=21.3-(4.17+5.83),
=21.3-10,
=11.3;
(7)(-)÷+,
=,
=,
=1;
(8)-(-)÷,
=-÷,
=,
=.
分析:(1)(2)(3)(4)(7)(8)依据四则运算计算方法,先算第二级运算,再算第一级运算,如果只含有同一级运算,按照从左到右顺序计算,有括号先算括号里面的解答;(5)运用乘法分配律解答;(6)依据减法性质解答.
点评:本题主要考查学生依据四则运算计算方法,依据正确选择并运用简便算法解决问题的能力.解答的关键是计算的准确性.
=6-5,
=1;
(2)15÷0.5×2,
=30×2,
=60;
(3)(12×)÷3,
=9÷3,
=3;
(4)12-12×0.4+0.6,
=12-4.8+0.6,
=7.2+0.6,
=7.8;
(5)×15+6÷,
=×(15+6),
=×21,
=15;
(6)21.3-4.17-5.83,
=21.3-(4.17+5.83),
=21.3-10,
=11.3;
(7)(-)÷+,
=,
=,
=1;
(8)-(-)÷,
=-÷,
=,
=.
分析:(1)(2)(3)(4)(7)(8)依据四则运算计算方法,先算第二级运算,再算第一级运算,如果只含有同一级运算,按照从左到右顺序计算,有括号先算括号里面的解答;(5)运用乘法分配律解答;(6)依据减法性质解答.
点评:本题主要考查学生依据四则运算计算方法,依据正确选择并运用简便算法解决问题的能力.解答的关键是计算的准确性.
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