Question

Помогите 984 985 дам 98 баллов!!

Answer 1

Ответ:

Пошаговое объяснение:

$1) 1,(8) = 1dfrac{8}{9} \\2) 0,(3)=dfrac{3}{9} =dfrac{1}{3} \\3)0,(7)=dfrac{7}{9} \\4)3,(5)=3dfrac{5}{9} \\5)0,1(2)=dfrac{12-1}{90} =dfrac{11}{90} \\6)1,12(3)=1dfrac{123-12}{900} =1dfrac{111}{900} =1dfrac{37}{300} \\7)7,5(4)=7dfrac{54-5}{90} =1dfrac{49}{90} \\8)0,(35)=dfrac{35}{99} \\9)0,(59)=dfrac{59}{99}\\ 10)0,(12)=dfrac{12}{99} =dfrac{4}{33} \\11)1,0(12)=1dfrac{12}{990} =1dfrac{4}{330}\\ 12)8,7(21)=8dfrac{721-7}{990}=8dfrac{119}{165}$

$2.\0,3(9) = a\\10a = 3,(9) = 3,6 + 0,3(9) = 3,6 + a\9a = 3,6\a = 0,4$

$1,2(9)=a\\10a = 12,(9) = 11,7 + 1,2(9) =11,7+a\9a = 11,7\a = 1,3$