题目内容
(2010?兴国县)合理、灵活地计算.
①(12.5×8-40)÷60%
②
×
+
÷
③(
÷
-
)÷
④
÷[(
+
)×
].
①(12.5×8-40)÷60%
②
2 |
7 |
11 |
24 |
2 |
7 |
24 |
13 |
③(
1 |
6 |
5 |
12 |
1 |
6 |
7 |
15 |
④
1 |
5 |
2 |
3 |
1 |
5 |
1 |
13 |
分析:(1)(3)(4)根据四则运算计算方法解答,
(2)运用乘法分配律解答.
(2)运用乘法分配律解答.
解答:解:(1)(12.5×8-40)÷60%,
=(100-40)÷60%,
=60÷60%,
=100;
(2)
×
+
÷
,
=
×(
+
),
=
×1,
=
;
(3)(
÷
-
)÷
,
=(
-
)÷
,
=
÷
,
=0.5;
(4)
÷[(
+
)×
],
=
÷[
×
],
=
÷
,
=3.
=(100-40)÷60%,
=60÷60%,
=100;
(2)
2 |
7 |
11 |
24 |
2 |
7 |
24 |
13 |
=
2 |
7 |
11 |
24 |
13 |
24 |
=
2 |
7 |
=
2 |
7 |
(3)(
1 |
6 |
5 |
12 |
1 |
6 |
7 |
15 |
=(
2 |
5 |
1 |
6 |
7 |
15 |
=
7 |
30 |
7 |
15 |
=0.5;
(4)
1 |
5 |
2 |
3 |
1 |
5 |
1 |
13 |
=
1 |
5 |
13 |
15 |
1 |
13 |
=
1 |
5 |
1 |
15 |
=3.
点评:本题主要考查学生对于四则运算计算方法,以及乘法分配律掌握.
练习册系列答案
相关题目