Ответ:
9/10 - 3/10 = 6/10 = 3/5
1 - 7/8 = 8/8 - 7/8 = 1/8
1/4 - 1/12 = 3/12 - 1/12 = 2/12 = 1/6
14x + 27x = 656
41x=656
x= 16
81y=645
y=7 <u>78</u>
81