题目内容
下列各题怎么简算就怎么算.
(1)99.14×16+0.86×1
(2)125×0.59×0.8
(3)
×0.25×
×4
(4)4725-379-221
(5)6
×(2-1
)+3
×
.
(1)99.14×16+0.86×1
(2)125×0.59×0.8
(3)
| 7 |
| 3 |
| 2 |
| 7 |
(4)4725-379-221
(5)6
| 7 |
| 8 |
| 37 |
| 50 |
| 1 |
| 8 |
| 13 |
| 50 |
(1)99.14×16+0.86×1,
=(100-0.86)×16+0.86×1,
=1600-0.86×16+0.86×1,
=1600-0.86×(16-1),
=1600-0.86×15,
=1600-12.9,
=1587.1;
(2)125×0.59×0.8,
=(125×0.8)×0.59,
=100×0.59,
=59;
(3)
×0.25×
×4,
=
×
×(0.25×4),
=
×1,
=
;
(4)4725-379-221,
=4725-(379+221),
=4725-600,
=4125;
(5)6
×(2-1
)+3
×
,
=
×
+
×
,
=(
+
)×
,
=10×
,
=
.
=(100-0.86)×16+0.86×1,
=1600-0.86×16+0.86×1,
=1600-0.86×(16-1),
=1600-0.86×15,
=1600-12.9,
=1587.1;
(2)125×0.59×0.8,
=(125×0.8)×0.59,
=100×0.59,
=59;
(3)
| 7 |
| 3 |
| 2 |
| 7 |
=
| 7 |
| 3 |
| 2 |
| 7 |
=
| 2 |
| 3 |
=
| 2 |
| 3 |
(4)4725-379-221,
=4725-(379+221),
=4725-600,
=4125;
(5)6
| 7 |
| 8 |
| 37 |
| 50 |
| 1 |
| 8 |
| 13 |
| 50 |
=
| 55 |
| 8 |
| 13 |
| 50 |
| 25 |
| 8 |
| 13 |
| 50 |
=(
| 55 |
| 8 |
| 25 |
| 8 |
| 13 |
| 50 |
=10×
| 13 |
| 50 |
=
| 13 |
| 5 |
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