题目内容
(2010?夹江县模拟)怎样简便就怎样算.
82-5.6÷0.8×0.6
81÷14+17×
×
+
×
-
×(1÷
-1)
82-5.6÷0.8×0.6
81÷14+17×
| 1 |
| 14 |
| 3 |
| 13 |
| 4 |
| 5 |
| 10 |
| 13 |
| 4 |
| 5 |
| 4 |
| 5 |
| 2 |
| 3 |
| 3 |
| 4 |
分析:(1)(4)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,
(2)(3)运用乘法分配律解答.
(2)(3)运用乘法分配律解答.
解答:解:(1)82-5.6÷0.8×0.6,
=82-7×0.6,
=82-4.2,
=77.8;
(2)81÷14+17×
,
=(81+17)×
,
=98×
,
=7;
(3)
×
+
×
-
,
=(
+
-1)×
,
=0×
,
=0;
(4)
×(1÷
-1),
=
×(
-1),
=
×
,
=
.
=82-7×0.6,
=82-4.2,
=77.8;
(2)81÷14+17×
| 1 |
| 14 |
=(81+17)×
| 1 |
| 14 |
=98×
| 1 |
| 14 |
=7;
(3)
| 3 |
| 13 |
| 4 |
| 5 |
| 10 |
| 13 |
| 4 |
| 5 |
| 4 |
| 5 |
=(
| 3 |
| 13 |
| 10 |
| 13 |
| 4 |
| 5 |
=0×
| 4 |
| 5 |
=0;
(4)
| 2 |
| 3 |
| 3 |
| 4 |
=
| 2 |
| 3 |
| 4 |
| 3 |
=
| 2 |
| 3 |
| 1 |
| 3 |
=
| 2 |
| 9 |
点评:本题主要考查学生运用四则运算计算方法进行计算,以及正确运用简便算法的能力.
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