题目内容
下面各题，怎样算简便就怎样算．
3.7×
+5.3×0.75+
38×
9.9+99.9+999.9
6.8÷4-1.2×25%+4
×0.25
（
+
）×24×15．
3.7×
| 3 |
| 4 |
| 3 |
| 4 |
38×
| 3 |
| 37 |
9.9+99.9+999.9
6.8÷4-1.2×25%+4
| 2 |
| 5 |
（
| 5 |
| 12 |
| 1 |
| 15 |
（1）3.7×
+5.3×0.75+
=0.75×（3.7+5.3+1）
=7.5；
（2）38×
=（37+1）×
=3+
=3
；
（3）9.9+99.9+999.9
=10+100+1000-0.1-0.1-0.1
=1110-0.3
=1109.7；
（4）6.8÷4-1.2×25%+4
×0.25
=6.8×0.25-1.2×0.25+4.4×0.25
=（6.8-1.2+4.4）×0.25
=10×0.25
=2.5；
（5）（
+
）×24×15
=
×24×15+
×24×15
=150+24
=174．
| 3 |
| 4 |
| 3 |
| 4 |
=0.75×（3.7+5.3+1）
=7.5；
（2）38×
| 3 |
| 37 |
=（37+1）×
| 3 |
| 37 |
=3+
| 3 |
| 37 |
=3
| 3 |
| 37 |
（3）9.9+99.9+999.9
=10+100+1000-0.1-0.1-0.1
=1110-0.3
=1109.7；
（4）6.8÷4-1.2×25%+4
| 2 |
| 5 |
=6.8×0.25-1.2×0.25+4.4×0.25
=（6.8-1.2+4.4）×0.25
=10×0.25
=2.5；
（5）（
| 5 |
| 12 |
| 1 |
| 15 |
=
| 5 |
| 12 |
| 1 |
| 15 |
=150+24
=174．
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