题目内容
(2013?涪城区)计算下列各题:
①17.09-3.63-6.37+0.91 | ②10÷〔
| ||||||||||
③198÷
|
④
|
分析:①运用加法的结合律及结合律进行解答即可②④运用分数的四则混合运算的顺序进行计算即可.③运用乘法的分配律进行计算即可.
解答:解:①17.09-3.63-6.37+0.91,
=(17.09+0.91)-(3.63+6.37),
=18-10,
=8;
②10÷〔
-(
÷
+
)〕,
=10÷[
-(
×
+
)],
=10÷[
-
],
=10÷[
-
],
=10÷
,
=10×
,
=37.5;
③198÷
+202×
,
=198×
+202×
,
=
×(198+202),
=300;
④
×〔1÷(
-
)〕,
=
×〔1÷
〕,
=
×
,
=2.5;
=(17.09+0.91)-(3.63+6.37),
=18-10,
=8;
②10÷〔
8 |
3 |
5 |
13 |
5 |
26 |
2 |
5 |
=10÷[
8 |
3 |
5 |
13 |
26 |
5 |
2 |
5 |
=10÷[
8 |
3 |
12 |
5 |
=10÷[
40 |
15 |
36 |
15 |
=10÷
4 |
15 |
=10×
15 |
4 |
=37.5;
③198÷
4 |
3 |
3 |
4 |
=198×
3 |
4 |
3 |
4 |
=
3 |
4 |
=300;
④
7 |
8 |
7 |
10 |
7 |
20 |
=
7 |
8 |
7 |
20 |
=
7 |
8 |
20 |
7 |
=2.5;
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.
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