Clever calculation and speed arithmeticFour operations on decimals and fractionsMultiply divide fractions
Worked solution
1. 将各个括号内的算式分别计算为最简分数
计算每个括号内的加减法:
代入原式得:
2. 运用乘法交换律与结合律对项进行分组并约分
将加法项与减法项分别分组重组:
第一组交叉约分后保留第一个分母与最后一个分子:
第二组交叉约分后保留第一个分子与最后一个分母:
3. 计算两组结果的乘积得到最终答案
将化简后的两部分相乘:
Answer
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