题目内容
计算下面各题(能简算的要使用简便算法).
×(
-
)
÷7+
×
(
+
-
)÷
÷
÷
.
| 3 |
| 10 |
| 5 |
| 7 |
| 10 |
| 21 |
| 6 |
| 13 |
| 1 |
| 7 |
| 8 |
| 13 |
| 1 |
| 8 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 24 |
| 5 |
| 7 |
| 4 |
| 21 |
| 15 |
| 16 |
(1)
| 3 |
| 10 |
| 5 |
| 7 |
| 10 |
| 21 |
=
| 3 |
| 10 |
| 5 |
| 21 |
=
| 1 |
| 14 |
(2)
| 6 |
| 13 |
| 1 |
| 7 |
| 8 |
| 13 |
=
| 6 |
| 13 |
| 1 |
| 7 |
| 1 |
| 7 |
| 8 |
| 13 |
=(
| 6 |
| 13 |
| 8 |
| 13 |
| 1 |
| 7 |
=
| 14 |
| 13 |
| 1 |
| 7 |
=
| 2 |
| 13 |
(3)(
| 1 |
| 8 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 24 |
=(
| 1 |
| 8 |
| 1 |
| 3 |
| 1 |
| 4 |
=
| 1 |
| 8 |
| 1 |
| 3 |
| 1 |
| 4 |
=3+8-6,
=11-6,
=5;
(4)
| 5 |
| 7 |
| 4 |
| 21 |
| 15 |
| 16 |
=
| 15 |
| 4 |
| 15 |
| 16 |
=4.
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