题目内容
计算下面各题,注意使用简便算法.
×
÷
420×(
+
)
×99+
×7+
×11.
| 7 |
| 3 |
| 5 |
| 7 |
| 1 |
| 3 |
420×(
| 3 |
| 7 |
| 5 |
| 6 |
| 4 |
| 25 |
| 4 |
| 25 |
| 5 |
| 9 |
| 5 |
| 9 |
(1)
×
÷
,
=
×
×3,
=5;
(2)420×(
+
),
=420×
+420×
,
=180+350,
=530;
(3)
×99+
,
=
×(99+1),
=
×100,
=16;
(4)
×7+
×11,
=
×(7+11),
=
×18,
=10.
| 7 |
| 3 |
| 5 |
| 7 |
| 1 |
| 3 |
=
| 7 |
| 3 |
| 5 |
| 7 |
=5;
(2)420×(
| 3 |
| 7 |
| 5 |
| 6 |
=420×
| 3 |
| 7 |
| 5 |
| 6 |
=180+350,
=530;
(3)
| 4 |
| 25 |
| 4 |
| 25 |
=
| 4 |
| 25 |
=
| 4 |
| 25 |
=16;
(4)
| 5 |
| 9 |
| 5 |
| 9 |
=
| 5 |
| 9 |
=
| 5 |
| 9 |
=10.
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