题目内容
| 下面各题,怎样简便就怎样算. 1÷(
| (
| 6.8×57+430×0.68 |
|
(1)1÷(
+
)×
,
=1÷
×
,
=
×
,
=
;
(2)(
+
)÷
×
,
=
÷
×
,
=
×
,
=
;
(3)6.8×57+430×0.68,
=6.8×57+43×6.8,
=6.8×(57+43),
=6.8×100,
=680;
(4)
+
+
-
,
=(
+
)+(
-
),
=1+
,
=1
.
| 1 |
| 3 |
| 3 |
| 4 |
| 13 |
| 36 |
=1÷
| 13 |
| 12 |
| 13 |
| 36 |
=
| 12 |
| 13 |
| 13 |
| 36 |
=
| 1 |
| 3 |
(2)(
| 4 |
| 5 |
| 1 |
| 4 |
| 3 |
| 10 |
| 10 |
| 3 |
=
| 21 |
| 20 |
| 3 |
| 10 |
| 10 |
| 3 |
=
| 7 |
| 2 |
| 10 |
| 3 |
=
| 35 |
| 3 |
(3)6.8×57+430×0.68,
=6.8×57+43×6.8,
=6.8×(57+43),
=6.8×100,
=680;
(4)
| 3 |
| 4 |
| 11 |
| 15 |
| 1 |
| 4 |
| 1 |
| 15 |
=(
| 3 |
| 4 |
| 1 |
| 4 |
| 11 |
| 15 |
| 1 |
| 15 |
=1+
| 2 |
| 3 |
=1
| 2 |
| 3 |
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