题目内容
| 脱式计算(其中①、②、④、⑤要用简便方法). ①59×
| ②
| ③
| ||||||||||||||||
④
| ⑤(
| ⑥16-8×
|
(1)59×
,
=58×
+1×
,
=17+
,
=17
;
(2)
×
+1
×
,
=(
+1
)×
,
=2×
,
=1
;
(3)
-
×
,
=
-
,
=
;
(4)
×
×
,
=
×
×
,
=
×
,
=
;
(5)(
+
)×24,
=
×24+
×24,
=10+9,
=19;
(6)16-8×
,
=16-3,
=13.
| 17 |
| 58 |
=58×
| 17 |
| 58 |
| 17 |
| 58 |
=17+
| 17 |
| 58 |
=17
| 17 |
| 58 |
(2)
| 5 |
| 7 |
| 5 |
| 8 |
| 2 |
| 7 |
| 5 |
| 8 |
=(
| 5 |
| 7 |
| 2 |
| 7 |
| 5 |
| 8 |
=2×
| 5 |
| 8 |
=1
| 1 |
| 4 |
(3)
| 5 |
| 7 |
| 5 |
| 7 |
| 1 |
| 5 |
=
| 5 |
| 7 |
| 1 |
| 7 |
=
| 4 |
| 7 |
(4)
| 13 |
| 24 |
| 8 |
| 19 |
| 9 |
| 26 |
=
| 13 |
| 24 |
| 9 |
| 26 |
| 8 |
| 19 |
=
| 9 |
| 48 |
| 8 |
| 19 |
=
| 3 |
| 38 |
(5)(
| 5 |
| 12 |
| 3 |
| 8 |
=
| 5 |
| 12 |
| 3 |
| 8 |
=10+9,
=19;
(6)16-8×
| 3 |
| 8 |
=16-3,
=13.
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