[tex]4* \frac{45 \frac{10}{63}- 44\frac{25}{84} }{ (2\frac{1}{3}- 1\frac{1}{9}):4- \frac{3}{4} } [/tex]

1) 45  10/63 - 44 25/84 = 1 10/63 - 25/84 = 73/63 - 25/84 =     = 4*73/252 - 3*25/252 = 292/252 - 75/252 = 217/252 = 31/362) 2 1/3 - 1 1/9 = 7/3 - 10/9 = 21/9 - 10/9 = 11/93) 11/9 : 4 = 11/364) 11/36 - 3/4 = 11/36 - 27/36 = - 16/365) 31/36 : (- 16/36) = - 31/166) 4 * (- 31/36) = - 31/4 = - 7  3/4