《分数四则混合运算》口算练习

$1\div left ( {\frac {1} {2}-\frac {1} {3}} ight )=$

$4\div left ( {1-\frac {2} {3}} ight )=$

$1\div \frac {1} {5}+5=$

$\frac {12} {5}\div 3\div \frac {12} {5}=$

$10\div \frac {5} {2}\div \frac {2} {5}=$

$\frac {8} {21}\div 12\times 0=$

$16\times left ( {\frac {1} {4}+\frac {1} {8}} ight )=$

$\frac {7} {8}\times \frac {7} {8}\div \frac {7} {8}=$

$\frac {1} {5}\times 5\div \frac {1} {7}=$