Question

11/12-3/7= 5/6-1/3= 1/2-1/14= 11/18-2/9= 9/20-11/36= 8/15-1/12= 1/4-1/12= 8/21-3/8= 5/7-1/6= 8/15-1/5= 1/5-1/15= 5/6-3/5= 5/9-4/12=

Answer 1

11/12-3/7 = (11*7 - 3*12) / (12*7) = 41/84

5/6-1/3= 5/6 - 2/6 = 3/6 = 1/2

1/2-1/14= 7/14 - 1/14 = 6/14 = 3/7

11/18-2/9= 11/18 - 4/18 = 7/18

9/20-11/36= (9*36 - 11*20) / (36*20) = 104/720 = 13/90

8/15-1/12= (8*4 - 1*5) / (3*4*5) = 27 / 60 = 9/20

1/4-1/12= 3/12 - 1/12 = 2/12 = 1/6

8/21-3/8= (8*8 - 3*21) / (21*8) = 1/168

5/7-1/6= (5*6 - 1*7) / (6*7) = 23/42

8/15-1/5=8/15 - 3/15 = 5/15 = 1/3

1/5-1/15=3/15 - 1/15 = 2/15

5/6-3/5= (5*5 - 3*6) / (5*6) = 7/30

5/9-4/12= (5*4 - 4*3) / (3*3*4) = 8/36 = 2/9

Answer 2

Здравствуйте, это Bing. Я могу помочь вам решить эти выражения, используя правило, что для вычитания дробей с разными знаменателями нужно привести их к общему знаменателю, а затем вычесть числители и оставить знаменатель без изменений. Вот подробные решения: 11/12-3/7= (11*7-3*12)/(12*7) = (77-36)/84 = 41/84 = 41/(2*2*3*7) = (41/4)/(3*7) = 41/4 * 1/(3*7) = 41/4 * 7/21 = (41*7)/(4*21) = 287/84 5/6-1/3= (5*3-1*6)/(6*3) = (15-6)/18 = 9/18 = 9/(2*3*3) = (9/2)/(3*3) = 9/2 * 1/(3*3) = 9/2 * 3/9 = (9*3)/(2*9) = 27/18 1/2-1/14= (1*14-1*2)/(2*14) = (14-2)/28 = 12/28 = 12/(2*2*7) = (12/4)/7 = 12/4 * 1/7 = 12/4 * 7/49 = (12*7)/(4*49) = 84/196 11/18-2/9= (11*9-2*18)/(18*9) = (99-36)/162 = 63/162 = 63/(2*3*3*3*3) = (63/9)/(2*3*3) = 63/9 * 1/(2*3*3) = 63/9 * 6/18 = (63*6)/(9*18) = 378/162 9/20-11/36= (9*36-11*20)/(20*36) = (324-220)/720 = 104/720 = 104/(2*2*2*2*5*9) = (104/8)/(5*9) = 104/8 * 1/(5*9) = 104/8 * 45/225 = (104*45)/(8*225) = 4680/1800 8/15-1/12= (8*12-1*15)/(15*12) = (96-15)/180 = 81/180 = 81/(2