题目内容
(2012?仙游县模拟)计算下面各题,怎样算简便就怎样算.
3720-4028÷38
78.192÷7.2-5.4×1.04
[
+(
-
)]÷17
43×
+57÷
.
3720-4028÷38
78.192÷7.2-5.4×1.04
[
1 |
9 |
7 |
8 |
3 |
4 |
43×
3 |
4 |
4 |
3 |
分析:算式(1)(2)(3)根据四则混合运算的运算顺序计算即可:先算乘除,再算加减,有括号的要先算括号里面的;
算式(4)可根据乘法分配律计算.
算式(4)可根据乘法分配律计算.
解答:解:(1)3720-4028÷38
=3720-106,
=3614;
(2)78.192÷7.2-5.4×1.04
=10.86-5.616,
=5.244;
(3)[
+(
-
)]÷17
=[
+
]×
,
=
×
,
=
;
(4)43×
+57÷
=43×
+57×
,
=(43+57)×
,
=100×
,
=75.
=3720-106,
=3614;
(2)78.192÷7.2-5.4×1.04
=10.86-5.616,
=5.244;
(3)[
1 |
9 |
7 |
8 |
3 |
4 |
=[
1 |
9 |
1 |
8 |
1 |
17 |
=
17 |
72 |
1 |
17 |
=
1 |
72 |
(4)43×
3 |
4 |
4 |
3 |
=43×
3 |
4 |
3 |
4 |
=(43+57)×
3 |
4 |
=100×
3 |
4 |
=75.
点评:在完成有关于小数乘除法的计算时要注意小数点位置的变化.
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