题目内容
递等式计算.
(1)16-3.25×0.6+3.05
(2)
×0.5+2.5÷125%
(3)
÷[(
+
)×
]
(4)2
+3.6×〔(3
-1
)÷3.5〕
(1)16-3.25×0.6+3.05
(2)
1 |
8 |
(3)
1 |
5 |
2 |
3 |
1 |
5 |
1 |
13 |
(4)2
2 |
5 |
1 |
12 |
5 |
8 |
分析:根据整数运算法则在小数、分数、百分数中的应用解答即可.
解答:解:(1)16-3.25×0.6+3.05
=16-1.95+3.05
=14.05+3.05
=17.1;
(2)
×0.5+2.5÷125%
=0.125×0.5+2.5÷1.25
=0.0625+2
=2.0625;
(3)
÷[(
+
)×
]
=
÷[(
+
)×
]
=
÷[
×
]
=
÷
=
×15
=3;
(4)2
+3.6×[(3
-1
)÷3.5]
=2
+3.6×[(
-
)÷
]
=2
+3.6×[
×
]
=2
+
×
=2.4+
=2.4+1.5
=3.9.
=16-1.95+3.05
=14.05+3.05
=17.1;
(2)
1 |
8 |
=0.125×0.5+2.5÷1.25
=0.0625+2
=2.0625;
(3)
1 |
5 |
2 |
3 |
1 |
5 |
1 |
13 |
=
1 |
5 |
10 |
15 |
3 |
15 |
1 |
13 |
=
1 |
5 |
13 |
15 |
1 |
13 |
=
1 |
5 |
1 |
15 |
=
1 |
5 |
=3;
(4)2
2 |
5 |
1 |
12 |
5 |
8 |
=2
2 |
5 |
74 |
24 |
39 |
24 |
7 |
2 |
=2
2 |
5 |
35 |
24 |
2 |
7 |
=2
2 |
5 |
18 |
5 |
5 |
12 |
=2.4+
3 |
2 |
=2.4+1.5
=3.9.
点评:此题主要考查的是整数运算法则在小数、分数、百分数中的应用及小数分数和百分数之间的互化.
练习册系列答案
相关题目