怎样简便就怎样算（12.5-0.125）×8； 5.25×15-0.75÷5； 253×102；...
怎样简便就怎样算（12.5-0.125）×8；5.25×15-0.75÷5；253×102；15÷[（23+15）×15]．...
怎样简便就怎样算（12.5-0.125）×8； 5.25×15-0.75÷5； 253×102； 15÷[（23+15）×15]．
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①（12.5-0.125）×8
=12.5×8-0.125×8
=100-1
=99；
②5.25×
-0.75÷5
=(5.25?0.75)×
=4.5×
=0.9；
③253×102
=253×100+253×2
=25300+506
=25806；
④
÷[（
+
）×15]
=
÷[
×15+
×15]
=
÷[10+3]
=
÷13
=
×
=
．
=12.5×8-0.125×8
=100-1
=99；
②5.25×
| 1 |
| 5 |
=(5.25?0.75)×
| 1 |
| 5 |
=4.5×
| 1 |
| 5 |
=0.9；
③253×102
=253×100+253×2
=25300+506
=25806；
④
| 1 |
| 5 |
| 2 |
| 3 |
| 1 |
| 5 |
=
| 1 |
| 5 |
| 2 |
| 3 |
| 1 |
| 5 |
=
| 1 |
| 5 |
=
| 1 |
| 5 |
=
| 1 |
| 5 |
| 1 |
| 13 |
=
| 1 |
| 65 |
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