题目内容
脱式计算.
(21+
)×
3-
×
-
8×
+
÷4.
(21+
| 2 |
| 5 |
| 5 |
| 7 |
3-
| 2 |
| 3 |
| 10 |
| 21 |
| 2 |
| 7 |
8×
| 5 |
| 6 |
| 2 |
| 5 |
(1)(21+
)×
,
=21×
+
×
,
=15+
,
=15
;
(2)3-
×
-
,
=3-
-
,
=3-(
+
),
=2
;
(3)8×
+
÷4,
=8×
+
×
,
=
+
,
=6
;
| 2 |
| 5 |
| 5 |
| 7 |
=21×
| 5 |
| 7 |
| 2 |
| 5 |
| 5 |
| 7 |
=15+
| 2 |
| 7 |
=15
| 2 |
| 7 |
(2)3-
| 2 |
| 3 |
| 10 |
| 21 |
| 2 |
| 7 |
=3-
| 20 |
| 63 |
| 2 |
| 7 |
=3-(
| 20 |
| 63 |
| 18 |
| 63 |
=2
| 25 |
| 63 |
(3)8×
| 5 |
| 6 |
| 2 |
| 5 |
=8×
| 5 |
| 6 |
| 2 |
| 5 |
| 1 |
| 4 |
=
| 20 |
| 3 |
| 1 |
| 10 |
=6
| 23 |
| 30 |
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