Помогите пожалуйста надо очень до завтра решить. за ранее спасибо

а) [latex] \frac{9}{56} [/latex] - ([latex] \frac{7}{15} [/latex] - [latex] \frac{5}{12} [/latex]) * ([latex] \frac{3}{14} [/latex] + [latex] \frac{1}{2} [/latex])1. [latex] \frac{7}{15} [/latex] - [latex] \frac{5}{12} [/latex] = [latex] \frac{28-25}{60} [/latex] = [latex] \frac{3}{60} [/latex] = [latex] \frac{1}{20} [/latex]2. [latex] \frac{3}{14} [/latex] + [latex] \frac{1}{2} [/latex]= [latex] \frac{3+7}{14} [/latex] = [latex] \frac{10}{14} [/latex] = [latex] \frac{5}{7} [/latex]3. [latex] \frac{1}{20} [/latex] * [latex] \frac{5}{7} [/latex] = [latex] \frac{1*5}{20*7} [/latex] = [latex] \frac{1}{28} [/latex]4.[latex] \frac{9}{56} [/latex] - [latex] \frac{1}{28} [/latex]= [latex] \frac{9-2}{56} [/latex]=[latex] \frac{7}{56} [/latex]=[latex] \frac{1}{8} [/latex]б) (2/3 + 7/8 - 5/6) * (1-5/17)1. 2/3 + 7/8 - 5/6 = 16+21-20/24 = 17/242. 1 - 5/17 = 17/17-5/17 = 12/173. 17/24 * 12/17 = 1/2в) (2 1/2)^2 *8/15 - 5/9 1. (2 1/2)^2 = (5/2)^2 =5^2/2^2=25/42. 25/4 * 8/15 = 25*8/4*15 = 10/33. 10/3 - 5/9 = 30-5/9 = 25/9 = 2 7/9г) (2 1/3 * 1 2/7)^3 * 2/91. (2 1/3 * 1 2/7)^3 =  7^3/3^3 * 9^3/7^3 = 343/27 * 729/343 = 272. 27 * 2/9 = 27*2 / 1*9 = 6д) (3 1/14 - 2 5/21) * (2,7-2,1)1. (3 1/14 - 2 5/21) = 43/14 - 47/21 = 129 - 94/42 = 35/42 = 5/62. 2.7 - 2.1 = 0.6 = 6/10 = 3/53. 5/6 * 3/5 = 1/2е) (4 13/18 - 3 7/9) * (1/2 - 4/17)1. 4 13/18 - 3 7/9 = 85/18 - 34/9 = 85-68/18 = 17/182. 1/2 - 4/17 = 17 - 8/ 34 = 9/343. 17/18 * 9/34 = 1/4ж) 7/11 * ((3/7)^2 + 5/7)1. (3/7)^2 = 3^2/7^2= 9/492. 9/49 + 5/7 = 9 + 35/49 = 44/493. 7/11 * 44/49 = 4/7з) (7/12 - 3/16 - 5/24) + (1/4)^21. (7/12 - 3/16 - 5/24) = 28-9+10/48 = 29/482. (1/4)^2 = 1^2/4^2 = 1/163. 29/48 + 1/16 = 29+ 3 /48 = 32/48 =  2/3

вот полностью решенный номер