题目内容
(2010?霞浦县)
怎样算简便就怎样算. 20.3×16-4560÷15 |
2.5×0.125×32 | ||||||||||||
6.3×
|
|
分析:①④按照小数、分数四则混合运算的顺序进行计算,先算乘除后算加减,有括号的先计算括号内的.
②运用乘法的结合律与交换律进行计算,使计算更加简便.
③运用乘法的分配律进行计算,使计算简便快捷.
②运用乘法的结合律与交换律进行计算,使计算更加简便.
③运用乘法的分配律进行计算,使计算简便快捷.
解答:解:①20.3×16-4560÷15,
=324.8-304,
=20.8;
②2.5×0.125×32,
=(2.5×4)×(0.125×8),
=10×1,
=10;
③6.3×
+6.3÷
,
=6.3×
+6.3×
,
=6.3×(
+
),
=6.3;
④
÷[(
+
)×
],
=
÷[(
+
)×
],
=
÷[
×
],
=
×
,
=1
.
=324.8-304,
=20.8;
②2.5×0.125×32,
=(2.5×4)×(0.125×8),
=10×1,
=10;
③6.3×
5 |
8 |
8 |
3 |
=6.3×
5 |
8 |
3 |
8 |
=6.3×(
5 |
8 |
3 |
8 |
=6.3;
④
8 |
9 |
1 |
3 |
2 |
5 |
8 |
11 |
=
8 |
9 |
5 |
15 |
6 |
15 |
8 |
11 |
=
8 |
9 |
11 |
15 |
8 |
11 |
=
8 |
9 |
15 |
8 |
=1
2 |
3 |
点评:本组题目考查了运算顺序及运算定律的选择与运用情况,同时考查了学生的计算能力.
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