题目内容
(1.65×2+1.56×3×
-
)×0.3÷0.5．
| 4 |
| 5 |
| 9 |
| 50 |
分析：通过观察，把分数化为小数计算较简便．先算括号内的乘法，然后括号内从左往右依次计算，最后算括号外的乘除，解决问题．
解答：解：（1.65×2+1.56×3×
-
）×0.3÷0.5
=（1.65×2+1.56×3×0.8-0.18）×0.3÷0.5
=（3.3+3.744-0.18）×0.3÷0.5
=6.864×0.3÷0.5
=2.0592÷0.5
=4.1184．
| 4 |
| 5 |
| 9 |
| 50 |
=（1.65×2+1.56×3×0.8-0.18）×0.3÷0.5
=（3.3+3.744-0.18）×0.3÷0.5
=6.864×0.3÷0.5
=2.0592÷0.5
=4.1184．
点评：此题通过数字转化，按照运算顺序和运算法则，解决问题．
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