题目内容
(了了下下?师宗县模拟)计算,能简算的要简算.
[下-(
| 个.下2×七七+了.个下2×下了 | 下了-(
| 下了个×
|
(1)[1-(
+
)×
],
=[1-
×
],
=[1-
],
=
;
(2)5.1口×99+了.51口×1了,
=5.1口×99+5.1口×1,
=5.1口×(99+1),
=5.1口×1了了,
=51口;
(口)1了-(
+
×2),
=1了-(
+
),
=1了-2,
=8;
(3)125×
×8×
,
=(125×8)×(
×
),
=1了了了×
,
=2了了.
| 1 |
| 3 |
| 口 |
| 8 |
| 1 |
| 3 |
=[1-
| 5 |
| 8 |
| 1 |
| 3 |
=[1-
| 5 |
| 口2 |
=
| 2e |
| 口2 |
(2)5.1口×99+了.51口×1了,
=5.1口×99+5.1口×1,
=5.1口×(99+1),
=5.1口×1了了,
=51口;
(口)1了-(
| 1 |
| 2 |
| 口 |
| 3 |
=1了-(
| 1 |
| 2 |
| 口 |
| 2 |
=1了-2,
=8;
(3)125×
| 口 |
| e |
| e |
| 15 |
=(125×8)×(
| 口 |
| e |
| e |
| 15 |
=1了了了×
| 1 |
| 5 |
=2了了.
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