题目内容
| 能简算的要简算. (
| 40%×
| ||||||||||||
39×
| 0.125×
|
(1)(
-
)×15,
=
×15-
×15,
=12-10,
=2;
(2)40%×
+
÷
,
=
×
+
×
,
=
×(
+
),
=
×1,
=
;
(3)39×
×
,
=(39×
)×
,
=21×
,
=
;
(4)0.125×
+
÷
+12.5%×
,
=0.125×
+0.125×
+0.125×
,
=0.125×(
+
+
),
=0.125×1,
=0.125.
| 4 |
| 5 |
| 2 |
| 3 |
=
| 4 |
| 5 |
| 2 |
| 3 |
=12-10,
=2;
(2)40%×
| 1 |
| 3 |
| 2 |
| 3 |
| 5 |
| 2 |
=
| 2 |
| 5 |
| 1 |
| 3 |
| 2 |
| 3 |
| 2 |
| 5 |
=
| 2 |
| 5 |
| 1 |
| 3 |
| 2 |
| 3 |
=
| 2 |
| 5 |
=
| 2 |
| 5 |
(3)39×
| 1 |
| 2 |
| 7 |
| 13 |
=(39×
| 7 |
| 13 |
| 1 |
| 2 |
=21×
| 1 |
| 2 |
=
| 21 |
| 2 |
(4)0.125×
| 4 |
| 11 |
| 1 |
| 8 |
| 11 |
| 2 |
| 5 |
| 11 |
=0.125×
| 4 |
| 11 |
| 2 |
| 11 |
| 5 |
| 11 |
=0.125×(
| 4 |
| 11 |
| 2 |
| 11 |
| 5 |
| 11 |
=0.125×1,
=0.125.
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