题目内容
计算下列题
|
75%×
|
| ||||||||||||||||
2
|
|
分析:前4道依据四则运算计算顺序,先算第二级运算,再算第一级运算,如果只含有同一级运算,按照从左到右顺序解答,最后一道运用乘法分配律解答.
解答:解:
×(
+
),
=
×
,
=
;
75%×
÷2.5,
=
÷2.5,
=
;
÷
-
×
,
=
-
,
=
;
2
÷(2.2+0.2)+
×6.9,
=2
÷2.4+
×6.9,
=1+4.6,
=5.6;
×0.5+
×
+
×
,
=(0.5+
+
)×
,
=1×
,
=
.
| 2 |
| 3 |
| 3 |
| 8 |
| 5 |
| 6 |
=
| 2 |
| 3 |
| 29 |
| 24 |
=
| 29 |
| 36 |
75%×
| 5 |
| 12 |
=
| 5 |
| 16 |
=
| 1 |
| 8 |
| 5 |
| 14 |
| 2 |
| 3 |
| 3 |
| 7 |
| 5 |
| 6 |
=
| 15 |
| 28 |
| 5 |
| 14 |
=
| 5 |
| 28 |
2
| 2 |
| 5 |
| 2 |
| 3 |
=2
| 2 |
| 5 |
| 2 |
| 3 |
=1+4.6,
=5.6;
| 3 |
| 4 |
| 3 |
| 4 |
| 1 |
| 3 |
| 3 |
| 4 |
| 1 |
| 6 |
=(0.5+
| 1 |
| 3 |
| 1 |
| 6 |
| 3 |
| 4 |
=1×
| 3 |
| 4 |
=
| 3 |
| 4 |
点评:完成本题要注意分析式中数据,运用合适的简便方法计算,如果没有简便算法要正确按照四则运算顺序进行计算,注意计算结果的准确性.
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