题目内容
脱式计算
①6.25-40÷16×2.5
②
+（4
-3
）÷
③（8
-10.5×
）÷4
④2
÷[5
-4.5×（20%+
）]．
①6.25-40÷16×2.5
②
| 1 |
| 12 |
| 5 |
| 12 |
| 1 |
| 2 |
| 11 |
| 24 |
③（8
| 5 |
| 6 |
| 4 |
| 5 |
| 1 |
| 3 |
④2
| 7 |
| 20 |
| 3 |
| 4 |
| 1 |
| 3 |
①6.25-40÷16×2.5
=6.25-40×2.5÷16，
=6.25-100÷16，
=6.25-6.25，
=0；
②
+（4
-3
）÷
=
+（
-
）×
，
=
+
×
，
=
+2，
=2
；
③（8
-10.5×
）÷4
=（8
-8
）÷
，
=（
-
）×
，
=（
-
）×
，
=
×
，
=
；
④2
÷[5
-4.5×（20%+
）]．
=2.35÷[5.75-（4.5×20%+4.5×
）]，
=2.35÷[5.75-（0.9+1.5）]，
=2.35÷[5.75-2.4]，
=2.35÷3.35，
=
．
=6.25-40×2.5÷16，
=6.25-100÷16，
=6.25-6.25，
=0；
②
| 1 |
| 12 |
| 5 |
| 12 |
| 1 |
| 2 |
| 11 |
| 24 |
=
| 1 |
| 12 |
| 53 |
| 12 |
| 42 |
| 12 |
| 24 |
| 11 |
=
| 1 |
| 12 |
| 11 |
| 12 |
| 24 |
| 11 |
=
| 1 |
| 12 |
=2
| 1 |
| 12 |
③（8
| 5 |
| 6 |
| 4 |
| 5 |
| 1 |
| 3 |
=（8
| 5 |
| 6 |
| 2 |
| 5 |
| 13 |
| 3 |
=（
| 53 |
| 6 |
| 42 |
| 5 |
| 3 |
| 13 |
=（
| 265 |
| 30 |
| 252 |
| 30 |
| 3 |
| 13 |
=
| 13 |
| 30 |
| 3 |
| 13 |
=
| 1 |
| 10 |
④2
| 7 |
| 20 |
| 3 |
| 4 |
| 1 |
| 3 |
=2.35÷[5.75-（4.5×20%+4.5×
| 1 |
| 3 |
=2.35÷[5.75-（0.9+1.5）]，
=2.35÷[5.75-2.4]，
=2.35÷3.35，
=
| 47 |
| 67 |
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