题目内容
计算下列各题,能简算的要简算.
| 28×
|
| ||||||||||||||||
85×
| 236÷
|
| ||||||||||||||||
45÷(1-
|
(1)
+[(
+
)+
],
=
+[(
+
)+
],
=
+[(
+
)+
],
=
+
,
=
;
(2)28×
,
=(27+1)×
,
=27×
+
,
=26+
,
=26
;
(3)
-(
+
),
=
-
-
,
=
-
-
,
=
;
(4)85×
,
=(86-1)×
,
=86×
-
,
=3-
,
=2
;
(5)236÷
+236÷
,
=236×
+236×
,
=236×(
+
),
=236×10,
=2360;
(6)
×
÷
,
=
×
×
,
=
;
(7)45÷(1-
)÷(1-
),
=45÷
÷
,
=45×
×
,
=120.
| 1 |
| 12 |
| 1 |
| 6 |
| 1 |
| 12 |
| 1 |
| 3 |
=
| 1 |
| 12 |
| 2 |
| 12 |
| 1 |
| 12 |
| 1 |
| 3 |
=
| 1 |
| 12 |
| 2 |
| 12 |
| 1 |
| 12 |
| 4 |
| 12 |
=
| 1 |
| 12 |
| 7 |
| 12 |
=
| 2 |
| 3 |
(2)28×
| 26 |
| 27 |
=(27+1)×
| 26 |
| 27 |
=27×
| 26 |
| 27 |
| 26 |
| 27 |
=26+
| 26 |
| 27 |
=26
| 26 |
| 27 |
(3)
| 9 |
| 14 |
| 2 |
| 7 |
| 3 |
| 14 |
=
| 9 |
| 14 |
| 2 |
| 7 |
| 3 |
| 14 |
=
| 9 |
| 14 |
| 4 |
| 14 |
| 3 |
| 14 |
=
| 1 |
| 7 |
(4)85×
| 3 |
| 86 |
=(86-1)×
| 3 |
| 86 |
=86×
| 3 |
| 86 |
| 3 |
| 86 |
=3-
| 3 |
| 86 |
=2
| 83 |
| 86 |
(5)236÷
| 5 |
| 9 |
| 5 |
| 41 |
=236×
| 9 |
| 5 |
| 41 |
| 5 |
=236×(
| 9 |
| 5 |
| 41 |
| 5 |
=236×10,
=2360;
(6)
| 5 |
| 9 |
| 8 |
| 15 |
| 4 |
| 9 |
=
| 5 |
| 9 |
| 8 |
| 15 |
| 9 |
| 4 |
=
| 2 |
| 3 |
(7)45÷(1-
| 2 |
| 5 |
| 3 |
| 8 |
=45÷
| 3 |
| 5 |
| 5 |
| 8 |
=45×
| 5 |
| 3 |
| 8 |
| 5 |
=120.
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