题目内容
(2009?宜昌)
用自己喜欢的方法计算. 205-105×12÷45 |
1.05×(3.8-0.8)÷6.3 |
(
| ||||||||
(
|
884÷34+17×21 | 3.75×(1.2-
|
分析:根据四则混合运算的运算顺序计算即可,①先算乘除后算减法.②先计算括号内部的,在从左向右依次计算.③④先教师括号内部的,再计算除法.⑤先计算乘除在计算加法.⑥先计算括号内部的,再计算括号外面的.
解答:解:①205-105×12÷45,
=205-105×12÷45,
=205-1260÷45,
=205-28,
=177;
②1.05×(3.8-0.8)÷6.3,
=1.05×3÷6.3,
=3.15÷6.3,
=0.5;
③(
+
)÷
,
=(
+
)÷
,
=
÷
,
=
×
,
=
;
④(
+
)÷50%,
=(
+
)÷
,
=
×2,
=1
;
⑤884÷34+17×21,
=26+357,
=383;
⑥3.75×(1.2-
)+
,
=3.75×(
-
)+
,
=3.75×
-3.75×
+
,
=4.5-1.25+0.75,
=4.
=205-105×12÷45,
=205-1260÷45,
=205-28,
=177;
②1.05×(3.8-0.8)÷6.3,
=1.05×3÷6.3,
=3.15÷6.3,
=0.5;
③(
1 |
5 |
1 |
3 |
8 |
9 |
=(
3 |
15 |
5 |
15 |
8 |
9 |
=
8 |
15 |
8 |
9 |
=
8 |
15 |
9 |
8 |
=
3 |
5 |
④(
1 |
2 |
1 |
4 |
=(
2 |
4 |
1 |
4 |
1 |
2 |
=
3 |
4 |
=1
1 |
2 |
⑤884÷34+17×21,
=26+357,
=383;
⑥3.75×(1.2-
1 |
3 |
3 |
4 |
=3.75×(
6 |
5 |
1 |
3 |
3 |
4 |
=3.75×
6 |
5 |
1 |
3 |
3 |
4 |
=4.5-1.25+0.75,
=4.
点评:完成本题要注意分析式中数据,运用合适的运算顺序进行计算.
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