题目内容
| 计算下面各题,怎样简便就怎样计算. 884÷34+17×21 | 1.25×3.2×0.25 | (
| ||||||||
4÷5+39×
| 4.2-1.38+5.8-4.62 | 2÷
|
(1)884÷34+17×21,
=26+357,
=383;
(2)1.25×3.2×0.25,
=1.25×(0.8×4)×0.25,
=(1.25×0.8)×(4×0.25),
=1×1,
=1;
(3)(
+
)÷
+
,
=
÷
+
,
=
+
,
=
;
(4)4÷5+39×
,
=
+39×
,
=
×(1+39),
=
×40,
=32;
(5)4.2-1.38+5.8-4.62,
=(4.2+5.8)-(1.38+4.62),
=10-6,
=4;
(6)2÷
-
÷2,
=5-
,
=4
.
=26+357,
=383;
(2)1.25×3.2×0.25,
=1.25×(0.8×4)×0.25,
=(1.25×0.8)×(4×0.25),
=1×1,
=1;
(3)(
| 4 |
| 5 |
| 1 |
| 4 |
| 7 |
| 3 |
| 3 |
| 10 |
=
| 21 |
| 20 |
| 7 |
| 3 |
| 3 |
| 10 |
=
| 9 |
| 20 |
| 3 |
| 10 |
=
| 3 |
| 4 |
(4)4÷5+39×
| 4 |
| 5 |
=
| 4 |
| 5 |
| 4 |
| 5 |
=
| 4 |
| 5 |
=
| 4 |
| 5 |
=32;
(5)4.2-1.38+5.8-4.62,
=(4.2+5.8)-(1.38+4.62),
=10-6,
=4;
(6)2÷
| 2 |
| 5 |
| 2 |
| 5 |
=5-
| 1 |
| 5 |
=4
| 4 |
| 5 |
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