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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