Question

помогите пожалуйста ​

Answer 1

Ответ:

Решение представлено на фотографиях

Answer 2

Ответ:

$85.$

$1-{5\over8}={3\over8}$

$1+2{5\over16}=3{5\over16}$

$8-{5\over12}=7{7\over12}$

$4-1{2\over3}=2{1\over3}$

$86.$

$5{2\over15}+3{5\over12}=8{8+25\over60}=8{33\over60}=8{11\over20}$

$9{4\over21}-4{11\over14}=5{8-33\over42}=4{(42+8)-33\over42}=4{17\over42}$

$5{13\over35}+2{13\over14}=7{26+65\over70}=7{90\over70}=7{9\over7}=8{2\over7}$

$5{5\over33}-4{7\over22}=1{10-14\over66}={(66+10)-14\over66}={62\over66}={31\over33}$

$87.$

$7-x=3{1\over3}\\7-3{1\over3}=x\\3{2\over3}=x$

$y+3{5\over9}=5{4\over9}\\y=5{4\over9}-3{5\over9}\\y=2{4-5\over9}\\y=1{(9+4)-5\over9}\\y=1{8\over9}$