问题
解答题
| 计算下列各题，能简算的要简算． ①5.25×3.6+5.25×3.4+5.25 ②（0.75+0.2）÷0.25×250% ③
④13×(
|
答案
①5.25×3.6+5.25×3.4+5.25，
=5.25+（3.6+3.4+1），
=5.25×8，
=42；
②（0.75+0.2）÷0.25×250%，
=0.95÷0.25×2.5，
=3.8×2.5，
=9.5；
③
| 1 |
| 8 |
| 5 |
| 8 |
| 1 |
| 3 |
| 3 |
| 7 |
=
| 1 |
| 8 |
| 7 |
| 24 |
| 3 |
| 7 |
=
| 1 |
| 8 |
| 1 |
| 8 |
=1；
④13×(
| 3 |
| 29 |
| 1 |
| 13 |
=（13×29）×（
| 3 |
| 29 |
| 1 |
| 13 |
=（29×
| 3 |
| 29 |
| 1 |
| 13 |
=（3×13）+（1×29），
=39+29，
=68．