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脱式计算,能简算的要简算720-2415÷23×6(38+712-16)×240.8×0.04×1.25×25025÷[(34+914)×1213][18+(512-14)]÷71223+12×35÷310.
题目详情
脱式计算,能简算的要简算
720-2415÷23×6 | (
| 0.8×0.04×1.25×250 | ||||||||||||||||||||||||
| [
|
|
▼优质解答
答案和解析
(1)720-2415÷23×6
=720-105×6
=720-630
=90;
(2)(
+
-
)×24
=
×24+
×24-
×24
=9+14-4
=23-4
=19;
(3)0.8×0.04×1.25×250
=(0.8×1.25)×(0.04×250)
=1×10
=10;
(4)
÷[(
+
)×
]
=
÷[
×
]
=
÷
=
;
(5)[
+(
-
)]÷
=[
+
]÷
=
÷
=
;
(6)
+
×
÷
=720-105×6
=720-630
=90;
(2)(
3 |
8 |
7 |
12 |
1 |
6 |
=
3 |
8 |
7 |
12 |
1 |
6 |
=9+14-4
=23-4
=19;
(3)0.8×0.04×1.25×250
=(0.8×1.25)×(0.04×250)
=1×10
=10;
(4)
2 |
5 |
3 |
4 |
9 |
14 |
12 |
13 |
=
2 |
5 |
39 |
28 |
12 |
13 |
=
2 |
5 |
9 |
7 |
=
14 |
45 |
(5)[
1 |
8 |
5 |
12 |
1 |
4 |
7 |
12 |
=[
1 |
8 |
1 |
6 |
7 |
12 |
=
7 |
24 |
7 |
12 |
=
1 |
2 |
(6)
2 |
3 |
1 |
2 |
3 |
5 |
3 |
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