$\frac{4} {17}, \frac{3} {10}, \frac{14} {53}\ $
$ \frac{13} {18}, \frac{7} {4} , \frac{3} {5} , \frac{19} {27} , \frac{7} {12}$
$\frac{1} {37}, \frac{2} {15}, \frac{1} {100}$
$\frac{9} {10}, \frac{9} {8}$
$\frac{11} {14} > \frac{16} {25} > \frac{4} {7} > \frac{4} {9} > \frac{7} {18}$
$130÷150=\frac{13} {15}\ $ $150÷300=\frac{1}{2}\ $ $98÷108=\frac{49}{54}$ $\ \frac{49} {54} > \frac{13} {15}>\frac{1}{2}$ $\ 所以丙店最值得信赖。$
$分子1、2、13的最小公倍数是26。\ $ $因为\frac{26} {104} < \frac{26} {13a} < \frac{26} {34}$ $所以34<13a<104,a可以是3,4,5,6,7。$
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