a) \(\frac{34}{13}=2\frac{8}{13}\)

Vì 2 > 1 nên \(2\frac{8}{13}>1\frac{7}{9}\)

hay \(\frac{34}{13}>1\frac{7}{9}\)

b) \(\frac{7}{9}=1-\frac{2}{9}\)

\(\frac{13}{15}=1-\frac{2}{15}\)

Vì \(\frac{2}{9}>\frac{2}{15}\) nên \(\frac{7}{9}< \frac{13}{15}\)

a) Ta có:

\(1\frac{7}{9}=\frac{16}{9}=\frac{208}{117}\) 

\(\frac{34}{13}=\frac{306}{117}\)

Vì \(306>208\)

\(\Rightarrow\frac{306}{117}>\frac{208}{117}\)

\(\Rightarrow\frac{34}{13}>1\frac{7}{9}\)

b) Ta có:

\(\frac{7}{9}=\frac{35}{45}\)

\(\frac{13}{15}=\frac{39}{45}\)

Vì \(39>35\)

\(\Rightarrow\frac{39}{45}>\frac{35}{45}\)

\(\Rightarrow\frac{13}{15}>\frac{7}{9}\)

a) A = 3/7

b) B = 73/13

c) C = 37/7

d) D = 12

ba câu a) ,b) ,c) bn đổi ra hỗn số giúp mk nha

tick cho tớ nha

a) \(A=11\dfrac{3}{13}-\left(3\dfrac{4}{7}-6\dfrac{3}{13}\right)\)

\(=11\dfrac{3}{13}-3\dfrac{4}{7}-6\dfrac{3}{13}\)

\(=\left(11\dfrac{3}{13}-6\dfrac{3}{13}\right)-3\dfrac{4}{7}\)

\(=1\dfrac{3}{7}\)

b) \(B=\left(7\dfrac{4}{9}+3\dfrac{8}{13}\right)-5\dfrac{4}{9}\)

\(=7\dfrac{4}{9}+3\dfrac{8}{13}-5\dfrac{4}{9}\)

\(=\left(7\dfrac{4}{9}-5\dfrac{4}{9}\right)+3\dfrac{8}{13}\)

\(=2+3\dfrac{8}{13}\)

\(=5\dfrac{8}{13}\)

c) \(C=\dfrac{-2}{7}.\dfrac{5}{11}+\dfrac{-2}{7}.\dfrac{6}{11}+5\dfrac{4}{7}\)

\(=\dfrac{-2}{7}.\left(\dfrac{5}{11}+\dfrac{6}{11}\right)+5\dfrac{4}{7}\)

\(=\dfrac{-2}{7}+5\dfrac{4}{7}\)

\(=\dfrac{-5}{7}+\dfrac{12}{7}\)

\(=\dfrac{7}{7}=1\)

d) \(D=0,7.1\dfrac{3}{5}.30.0,375.\dfrac{4}{7}\)

\(=\dfrac{7}{10}.\dfrac{8}{5}.30.\dfrac{375}{1000}.\dfrac{4}{7}\)

\(=\dfrac{36}{5}\)

\(=7,2\)

Em vào thống kê hỏi đáp của chị mà xem bài 1

thanks

a)\(\dfrac{11}{120};\dfrac{21}{120}\)

b)\(\dfrac{312}{1898};\dfrac{876}{1898}\)

c)\(\dfrac{28}{120};\dfrac{26}{120};\dfrac{-27}{120}\)

d)\(\dfrac{51}{180};\dfrac{-50}{180};\dfrac{-128}{180}\)

a) n = 4 ; 

b) n = 4 ; 

c) ???

d) n = 0 ; 1 ; 2 ; 3 ; 4 ; 5 ; 6 ; 7 ; 8 ; 9

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bằng dfgydejkdfRjkasjsuisbyozelzj

a) 13/57=13+16/57+16=29/73   ( Ghi nhớ SKG Toán 6)
-=> 13/57 < 29/73
b)  17/42 = 17-4/42-4 = 13/38
=> 17/42 > 13/38

c)7/41 = 7+6/41+6= 13/47
=> 7/41<13/47