Ответ:

x +1 ¾ =5 ⅓

x + ⁷/4 = ¹⁶/3

x=¹⁶/3-⁷/4

x= ⁴³/12

x =3 ⁷/12

(x+ ⁵/12)-1 ⅙=1 ¼

x+⁵/12- ⁷/6 = ⁵/4

x-¾= ⁵/4

x= ⁵/4 + ¾

x = ⁸/4

x=2

x - 4⅝ =3½

x= 3½ + 4⅝

x= ⁷/2 + ³⁷/8

x = ⁶⁵/8

x = 8 ⅛

Второе задание:

P= a+b+c

P= 30см

a= 8 ⁴/15

b= 8⁴/15 + 2 ⁵/9

c=?

b=10 ³⁷/45

c= S-(a+b)= 30- (8⁴/15+10³⁷/45) = 30- 19 ⁴/45= 10⁴¹/45

c= 10⁴¹/45