题目内容
脱式计算(能简算的要简算)
(1)
÷[1÷(
-
)]
(2)3.6-2.8+7.4-7.2
(3)87×
+
.
(1)
| 1 |
| 6 |
| 3 |
| 5 |
| 3 |
| 10 |
(2)3.6-2.8+7.4-7.2
(3)87×
| 3 |
| 86 |
| 83 |
| 86 |
(1)
÷[1÷(
-
)],
=
÷[1÷
],
=
÷
,
=
;
(2)3.6-2.8+7.4-7.2,
=(3.6+7.4)-(2.8+7.2),
=11-10,
=1;
(3)87×
+
,
=(86+1)×
+
,
=86×
+1×
+
,
=3+
+
,
=3+(
+
),
=3+1,
=4.
| 1 |
| 6 |
| 3 |
| 5 |
| 3 |
| 10 |
=
| 1 |
| 6 |
| 3 |
| 10 |
=
| 1 |
| 6 |
| 10 |
| 3 |
=
| 1 |
| 20 |
(2)3.6-2.8+7.4-7.2,
=(3.6+7.4)-(2.8+7.2),
=11-10,
=1;
(3)87×
| 3 |
| 86 |
| 83 |
| 86 |
=(86+1)×
| 3 |
| 86 |
| 83 |
| 86 |
=86×
| 3 |
| 86 |
| 3 |
| 86 |
| 83 |
| 86 |
=3+
| 3 |
| 86 |
| 83 |
| 86 |
=3+(
| 3 |
| 86 |
| 83 |
| 86 |
=3+1,
=4.
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