题目内容
计算下列各题,能简算的要简算.
×57
÷
+
÷
3-
÷
×
12÷[(
-
)×
].
| 53 |
| 56 |
| 5 |
| 12 |
| 3 |
| 4 |
| 5 |
| 12 |
| 1 |
| 4 |
3-
| 8 |
| 9 |
| 5 |
| 6 |
| 3 |
| 16 |
12÷[(
| 7 |
| 9 |
| 2 |
| 3 |
| 9 |
| 10 |
①
×57
=
×(56+1)
=
×56+
×1
=53+
=53
;
②
÷
+
÷
=
×
+
×
=
×(
+
)
=
×5
=2
;
③3-
÷
×
=3-
×
×
=3-
=2
;
④12÷[(
-
)×
]
=12÷(
×
-
×
)
=12÷(
-
)
=12÷
=120.
| 53 |
| 56 |
=
| 53 |
| 56 |
=
| 53 |
| 56 |
| 53 |
| 56 |
=53+
| 53 |
| 56 |
=53
| 53 |
| 56 |
②
| 5 |
| 12 |
| 3 |
| 4 |
| 5 |
| 12 |
| 1 |
| 4 |
=
| 5 |
| 12 |
| 4 |
| 3 |
| 5 |
| 12 |
| 4 |
| 1 |
=
| 5 |
| 12 |
| 4 |
| 3 |
| 4 |
| 1 |
=
| 5 |
| 12 |
| 1 |
| 3 |
=2
| 2 |
| 9 |
③3-
| 8 |
| 9 |
| 5 |
| 6 |
| 3 |
| 16 |
=3-
| 8 |
| 9 |
| 6 |
| 5 |
| 3 |
| 16 |
=3-
| 1 |
| 5 |
=2
| 4 |
| 5 |
④12÷[(
| 7 |
| 9 |
| 2 |
| 3 |
| 9 |
| 10 |
=12÷(
| 7 |
| 9 |
| 9 |
| 10 |
| 2 |
| 3 |
| 9 |
| 10 |
=12÷(
| 7 |
| 10 |
| 6 |
| 10 |
=12÷
| 1 |
| 10 |
=120.
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