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（2013•东莞）用简便方法计算①237×45+347×45-0.8②（27-15）×7×5③2.1×2.6+7.4×5.4+2.6×3.3④86.7×0.356+1.33×3.56．
题目详情
（2013•东莞）用简便方法计算
①2
×
+3
×
-0.8
②（
-
）×7×5
③2.1×2.6+7.4×5.4+2.6×3.3
④86.7×0.356+1.33×3.56．
①2
| 3 |
| 7 |
| 4 |
| 5 |
| 4 |
| 7 |
| 4 |
| 5 |
②（
| 2 |
| 7 |
| 1 |
| 5 |
③2.1×2.6+7.4×5.4+2.6×3.3
④86.7×0.356+1.33×3.56．
▼优质解答
答案和解析
①2
×
+3
×
-0.8
=2
×0.8+3
×0.8-0.8
=（2
+3
-1）×0.8
=5×0.8
=4；
②（
-
）×7×5
=
×7×5-
×7×5
=10-7
=3；
③2.1×2.6+7.4×5.4+2.6×3.3
=（2.1+3.3）×2.6+7.4×5.4
=5.4×2.6+7.4×5.4
=（2.6+7.4）×5.4
=10×5.4
=54；
④86.7×0.356+1.33×3.56
=8.67×3.56+1.33×3.56
=（8.67+1.33）×3.56
=10×3.56
=35.6
| 3 |
| 7 |
| 4 |
| 5 |
| 4 |
| 7 |
| 4 |
| 5 |
=2
| 3 |
| 7 |
| 4 |
| 7 |
=（2
| 3 |
| 7 |
| 4 |
| 7 |
=5×0.8
=4；
②（
| 2 |
| 7 |
| 1 |
| 5 |
=
| 2 |
| 7 |
| 1 |
| 5 |
=10-7
=3；
③2.1×2.6+7.4×5.4+2.6×3.3
=（2.1+3.3）×2.6+7.4×5.4
=5.4×2.6+7.4×5.4
=（2.6+7.4）×5.4
=10×5.4
=54；
④86.7×0.356+1.33×3.56
=8.67×3.56+1.33×3.56
=（8.67+1.33）×3.56
=10×3.56
=35.6
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