题目内容
| 怎样算简便就怎样算. (1)9×
| (2)
| (3)
| (4)(
|
(1)9×
+
×9,
=(
+
)×9,
=1×9,
=9;
(2)
-
×
-
,
=
-
-
,
=
-(
+
),
=
-1,
=
;
(3)
÷[
×(
+
)],
=
÷[
×
],
=
÷
,
=
;
(4)(
+
)×8+
,
=
×8+
×8+
,
=5+
+
,
=5+(
+
),
=5+1,
=6.
| 5 |
| 18 |
| 13 |
| 18 |
=(
| 5 |
| 18 |
| 13 |
| 18 |
=1×9,
=9;
(2)
| 5 |
| 3 |
| 5 |
| 9 |
| 3 |
| 2 |
| 1 |
| 6 |
=
| 5 |
| 3 |
| 5 |
| 6 |
| 1 |
| 6 |
=
| 5 |
| 3 |
| 5 |
| 6 |
| 1 |
| 6 |
=
| 5 |
| 3 |
=
| 2 |
| 3 |
(3)
| 1 |
| 8 |
| 1 |
| 25 |
| 2 |
| 5 |
| 1 |
| 10 |
=
| 1 |
| 8 |
| 1 |
| 25 |
| 1 |
| 2 |
=
| 1 |
| 8 |
| 1 |
| 50 |
=
| 25 |
| 4 |
(4)(
| 5 |
| 8 |
| 1 |
| 27 |
| 19 |
| 27 |
=
| 5 |
| 8 |
| 1 |
| 27 |
| 19 |
| 27 |
=5+
| 8 |
| 27 |
| 19 |
| 27 |
=5+(
| 8 |
| 27 |
| 19 |
| 27 |
=5+1,
=6.
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