题目内容
下面各题怎样简便就怎样算．
①4×0.8×2.5×12.5
②
÷[1-(
+
)]
③（2.8+3.85÷3.5）×4.6
④(
+
)×
+
．
①4×0.8×2.5×12.5
②
| 2 |
| 13 |
| 1 |
| 2 |
| 1 |
| 3 |
③（2.8+3.85÷3.5）×4.6
④(
| 24 |
| 29 |
| 16 |
| 17 |
| 1 |
| 8 |
| 15 |
| 17 |
①4×0.8×2.5×12.5；
=（4×2.5）×（0.8×12.5）；
=10×10；
=100；
②
÷[1-(
+
)]；
=
÷（1-
）；
=
÷
；
=
；
③（2.8+3.85÷3.5）×4.6；
=（2.8+1.1）×4.6；
=3.9×4.6；
=17.94；
④(
+
)×
+
；
=
×
+
×
+
；
=
+
+
；
=
+（
+
）；
=
+1；
=1
．
=（4×2.5）×（0.8×12.5）；
=10×10；
=100；
②
| 2 |
| 13 |
| 1 |
| 2 |
| 1 |
| 3 |
=
| 2 |
| 13 |
| 5 |
| 6 |
=
| 2 |
| 13 |
| 1 |
| 6 |
=
| 12 |
| 13 |
③（2.8+3.85÷3.5）×4.6；
=（2.8+1.1）×4.6；
=3.9×4.6；
=17.94；
④(
| 24 |
| 29 |
| 16 |
| 17 |
| 1 |
| 8 |
| 15 |
| 17 |
=
| 24 |
| 29 |
| 1 |
| 8 |
| 16 |
| 17 |
| 1 |
| 8 |
| 15 |
| 17 |
=
| 3 |
| 29 |
| 2 |
| 17 |
| 15 |
| 17 |
=
| 3 |
| 29 |
| 2 |
| 17 |
| 15 |
| 17 |
=
| 3 |
| 29 |
=1
| 3 |
| 29 |
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