题目内容
用简便方法计算下列各题.
①2.84×
+4.16÷
②38×
+17×0.25+45×25%
③0.125×32×2.5
④72×(
-
)+10.
①2.84×
| 3 |
| 7 |
| 7 |
| 3 |
②38×
| 1 |
| 4 |
③0.125×32×2.5
④72×(
| 5 |
| 9 |
| 5 |
| 12 |
①2.84×
+4.16÷
,
=(2.84+4.16)×
,
=7×
,
=3;
②38×
+17×0.25+45×25%,
=(38+17+45)×0.25,
=100×0.25,
=25;
③0.125×32×2.5,
=(0.125×8)×(4×2.5),
=1×10,
=10;
④72×(
-
)+10,
=72×
-72×
+10,
=40-30+10,
=20.
| 3 |
| 7 |
| 7 |
| 3 |
=(2.84+4.16)×
| 3 |
| 7 |
=7×
| 3 |
| 7 |
=3;
②38×
| 1 |
| 4 |
=(38+17+45)×0.25,
=100×0.25,
=25;
③0.125×32×2.5,
=(0.125×8)×(4×2.5),
=1×10,
=10;
④72×(
| 5 |
| 9 |
| 5 |
| 12 |
=72×
| 5 |
| 9 |
| 5 |
| 12 |
=40-30+10,
=20.
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