题目内容
计算下列各题,能简算的要简算,并把主要的计算过程写出来.
|
|
| ||||||||||||||||||
| 25×0.25×3.2= | 6-(
|
|
(1)
+
-
,
=
+
-
,
=
,
=
;
(2)
-
-
,
=
-(
+
),
=
-1,
=
;
(3)
+
+
,
=(
+
)+
,
=1+
,
=1
;
(4)25×0.25×3.2,
=25×0.25×(4×4×0.2),
=(25×4)×(0.25×4)×0.2,
=100×1×0.2,
=20;
(5)6-(
-
),
=6-(
-
),
=6-
,
=5
;
(6)
-
+
+
,
=(
+
)+(
-
),
=1+0,
=1.
| 7 |
| 8 |
| 3 |
| 4 |
| 11 |
| 12 |
=
| 21 |
| 24 |
| 18 |
| 24 |
| 22 |
| 24 |
=
| 21+18-22 |
| 24 |
=
| 17 |
| 24 |
(2)
| 15 |
| 11 |
| 3 |
| 8 |
| 5 |
| 8 |
=
| 15 |
| 11 |
| 3 |
| 8 |
| 5 |
| 8 |
=
| 15 |
| 11 |
=
| 4 |
| 11 |
(3)
| 5 |
| 9 |
| 7 |
| 12 |
| 4 |
| 9 |
=(
| 5 |
| 9 |
| 4 |
| 9 |
| 7 |
| 12 |
=1+
| 7 |
| 12 |
=1
| 7 |
| 12 |
(4)25×0.25×3.2,
=25×0.25×(4×4×0.2),
=(25×4)×(0.25×4)×0.2,
=100×1×0.2,
=20;
(5)6-(
| 3 |
| 4 |
| 2 |
| 5 |
=6-(
| 15 |
| 20 |
| 8 |
| 20 |
=6-
| 7 |
| 20 |
=5
| 13 |
| 20 |
(6)
| 3 |
| 4 |
| 2 |
| 7 |
| 1 |
| 4 |
| 2 |
| 7 |
=(
| 3 |
| 4 |
| 1 |
| 4 |
| 2 |
| 7 |
| 2 |
| 7 |
=1+0,
=1.
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