题目内容
| 怎样简便就怎样算. 56×(
| (
| ||||||||||||||
|
|
(1)56×(
-
),
=56×
-56×
,
=40-21,
=19;
(2)(
-
×
)÷
,
=(
-
)÷
,
=
×
,
=
;
(3)
÷[
×(
+
)],
=
÷[
×
],
=
÷
,
=
×
,
=
;
(4)
÷
÷
,
=
×
×
,
=
.
| 5 |
| 7 |
| 3 |
| 8 |
=56×
| 5 |
| 7 |
| 3 |
| 8 |
=40-21,
=19;
(2)(
| 7 |
| 8 |
| 7 |
| 8 |
| 5 |
| 14 |
| 5 |
| 16 |
=(
| 7 |
| 8 |
| 5 |
| 16 |
| 5 |
| 16 |
=
| 9 |
| 16 |
| 16 |
| 5 |
=
| 9 |
| 5 |
(3)
| 2 |
| 9 |
| 8 |
| 21 |
| 1 |
| 3 |
| 2 |
| 15 |
=
| 2 |
| 9 |
| 8 |
| 21 |
| 7 |
| 15 |
=
| 2 |
| 9 |
| 8 |
| 45 |
=
| 2 |
| 9 |
| 45 |
| 8 |
=
| 5 |
| 4 |
(4)
| 5 |
| 8 |
| 7 |
| 9 |
| 9 |
| 7 |
=
| 5 |
| 8 |
| 9 |
| 7 |
| 7 |
| 9 |
=
| 5 |
| 8 |
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