Question

17．$\frac{2}{5}$×$\frac{5}{6}$÷$\frac{2}{5}$×$\frac{5}{6}$=1×1=1．×．（判断对错）

Answer 1

分析 $\frac{2}{5}$×$\frac{5}{6}$÷$\frac{2}{5}$×$\frac{5}{6}$，只含有乘除法，按照从左向右的顺序求出结果，再判断．

解答 解：$\frac{2}{5}$×$\frac{5}{6}$÷$\frac{2}{5}$×$\frac{5}{6}$
=$\frac{1}{3}$÷$\frac{2}{5}$×$\frac{5}{6}$
=$\frac{5}{6}$×$\frac{5}{6}$
=$\frac{25}{36}$．
故答案为：×．

点评 只含有一级运算的，按照从左向右的顺序进行计算．