题目内容
脱式计算．
①231-152÷49
②
÷[（
+
）×
]
③5+0.45÷0.9-1.75
④1110÷（56×（
-
））
①231-152÷49
②
| 1 |
| 3 |
| 2 |
| 3 |
| 1 |
| 5 |
| 1 |
| 13 |
③5+0.45÷0.9-1.75
④1110÷（56×（
| 3 |
| 7 |
| 3 |
| 8 |
①231-152÷49
=231-3
．
=227
；
②
÷[（
+
）×
]
=
÷[
×
]，
=
×15，
=5；
③5+0.45÷0.9-1.75
=5+0.5-1.75，
=3.75；
④1110÷[56×（
-
）]
=1110÷[56×
-56×
]，
=1110÷[24-21]，
=1110÷3，
=370．
=231-3
| 5 |
| 49 |
=227
| 44 |
| 49 |
②
| 1 |
| 3 |
| 2 |
| 3 |
| 1 |
| 5 |
| 1 |
| 13 |
=
| 1 |
| 3 |
| 13 |
| 15 |
| 1 |
| 13 |
=
| 1 |
| 3 |
=5；
③5+0.45÷0.9-1.75
=5+0.5-1.75，
=3.75；
④1110÷[56×（
| 3 |
| 7 |
| 3 |
| 8 |
=1110÷[56×
| 3 |
| 7 |
| 3 |
| 8 |
=1110÷[24-21]，
=1110÷3，
=370．
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