Помогите решить! А) и б) Нужно до 12:20 ( 12:00)

Решите задачу:

$\frac{(8 \frac{1}{4}-3.51):2.37}{ \frac{1}{5}*3.17-2.205:3 \frac{1}{2} } =\frac{( \frac{33-3.51*4}{4}):2.37}{ \frac{1}{5}*3.17-2.205* \frac{2}{7} }= \\\\ =\frac{( \frac{33-14.04}{4}):2.37}{ \frac{1}{5}*3.17-2.205* \frac{2}{7} }==\frac{( \frac{33-14.04}{4}):2.37}{ \frac{1}{5}*3.17-2.205* \frac{2}{7} }=\\\\\ =\frac{( \frac{18.96}{4}):2.37}{ 0.634-0.63 }=\frac{4.74:2.37}{ 0.004 }=\frac{2}{ 0.004 }=500$

$\frac{(3 \frac{1}{3}-2.5)*6.6 }{15.717:3.1- \frac{1}{7}*0.49 } = \frac{(\frac{10-2.5*3}{3})*6.6 }{5.07- 0.07 }= \frac{\frac{2.5}{3}*6.6}{5 }= \frac{\frac{2.5}{3}*6.6}{5 }=\frac{2.5*2.2}{5}=\frac{5.5}{5 }=1.1$