题目内容
怎样简便就怎样算:
| 6.8×
| (
| 46×
|
(1)
×
×10,
=(
×10)×
,
=4×
,
=
;
(2)6.8×
+
×3.2,
=(6.8+3.2)×
,
=10×
,
=2;
(3)(
+
-
)×12,
=
×12+
×12-
×12,
=8+9-6,
=11;
(4)46×
,
=(45+1)×
,
=45×
+
,
=44+
,
=44
.
| 2 |
| 5 |
| 4 |
| 21 |
=(
| 2 |
| 5 |
| 4 |
| 21 |
=4×
| 4 |
| 21 |
=
| 16 |
| 21 |
(2)6.8×
| 1 |
| 5 |
| 1 |
| 5 |
=(6.8+3.2)×
| 1 |
| 5 |
=10×
| 1 |
| 5 |
=2;
(3)(
| 2 |
| 3 |
| 3 |
| 4 |
| 1 |
| 2 |
=
| 2 |
| 3 |
| 3 |
| 4 |
| 1 |
| 2 |
=8+9-6,
=11;
(4)46×
| 44 |
| 45 |
=(45+1)×
| 44 |
| 45 |
=45×
| 44 |
| 45 |
| 44 |
| 45 |
=44+
| 44 |
| 45 |
=44
| 44 |
| 45 |
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