题目内容
递等式计算（能简便的要简便）
①25.3×12-33.46÷0.35
②12.74-0.125+2.26-9.875
③（
+
）÷
④2.5×13×0.4
⑤
÷[（
+
）×
]
⑥
+
×19．
①25.3×12-33.46÷0.35
②12.74-0.125+2.26-9.875
③（
| 3 |
| 8 |
| 5 |
| 6 |
| 1 |
| 24 |
④2.5×13×0.4
⑤
| 8 |
| 9 |
| 2 |
| 5 |
| 1 |
| 10 |
| 3 |
| 4 |
⑥
| 4 |
| 5 |
| 4 |
| 5 |
①25.3×12-33.46÷0.35
=303.6-95.6
=208；
②12.74-0.125+2.26-9.875
=（12.74+2.26）-（0.125+9.875）
=15-10
=10；
③（
+
）÷
=（
+
）×24
=
×24+
×24
=9+20
=29；
④2.5×13×0.4
=2.5×0.4×13
=1×13
=13；
⑤
÷[（
+
）×
]
=
÷（
×
）
=
÷
=
×
=
；
⑥
+
×19
=（1+19）×
=20×
=16．
=303.6-95.6
=208；
②12.74-0.125+2.26-9.875
=（12.74+2.26）-（0.125+9.875）
=15-10
=10；
③（
| 3 |
| 8 |
| 5 |
| 6 |
| 1 |
| 24 |
=（
| 3 |
| 8 |
| 5 |
| 6 |
=
| 3 |
| 8 |
| 5 |
| 6 |
=9+20
=29；
④2.5×13×0.4
=2.5×0.4×13
=1×13
=13；
⑤
| 8 |
| 9 |
| 2 |
| 5 |
| 1 |
| 10 |
| 3 |
| 4 |
=
| 8 |
| 9 |
| 1 |
| 2 |
| 3 |
| 4 |
=
| 8 |
| 9 |
| 3 |
| 8 |
=
| 8 |
| 9 |
| 8 |
| 3 |
=
| 64 |
| 27 |
⑥
| 4 |
| 5 |
| 4 |
| 5 |
=（1+19）×
| 4 |
| 5 |
=20×
| 4 |
| 5 |
=16．
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