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计算下列各题,能简算的要简算.(1)12.5×3.2×25(2)379−1.16−1.84+129(3)(38+34−12)÷24(4)49×[34−(710−14)](5)19-19×1920(6)(8-10×45)÷13÷13.
题目详情
计算下列各题,能简算的要简算.
(1)12.5×3.2×25 | (2)3
| (3)(
| ||||||||||||||||
(4)
| (5)19-19×
| (6)(8-10×
|
▼优质解答
答案和解析
(1)12.5×3.2×25,
=12.5×0.8×4×25,
=(12.5×0.8)×(4×25),
=10×100,
=1000;
(2)3
−1.16−1.84+1
,
=(3
+1
)-(1.16+1.84),
=5-3,
=2;
(3)(
+
−
)÷24,
=(
-
)÷24,
=
÷24,
=
;
(4)
×[
−(
−
)],
=
×[
+
-
],
=
×(1-
),
=
×
,
=
;
(5)19-19×
,
=19×1-19×
,
=19×(1-
),
=19×
,
=
;
(6)(8-10×
)÷
,
=(8-8)÷
,
=0÷
,
=0.
=12.5×0.8×4×25,
=(12.5×0.8)×(4×25),
=10×100,
=1000;
(2)3
7 |
9 |
2 |
9 |
=(3
7 |
9 |
2 |
9 |
=5-3,
=2;
(3)(
3 |
8 |
3 |
4 |
1 |
2 |
=(
9 |
8 |
1 |
2 |
=
5 |
8 |
=
5 |
192 |
(4)
4 |
9 |
3 |
4 |
7 |
10 |
1 |
4 |
=
4 |
9 |
3 |
4 |
1 |
4 |
7 |
10 |
=
4 |
9 |
7 |
10 |
=
4 |
9 |
3 |
10 |
=
2 |
15 |
(5)19-19×
19 |
20 |
=19×1-19×
19 |
20 |
=19×(1-
19 |
20 |
=19×
1 |
20 |
=
19 |
20 |
(6)(8-10×
4 |
5 |
1 |
3 |
=(8-8)÷
1 |
3 |
=0÷
1 |
3 |
=0.
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