tinh nhanh( hôn sô): a.(7 4/9+4 7/11)-3 4/9 b.7 5/11-(2 3/7+3 5/11) c.7 5/9+(2 3/4-3 5/9) giup tui voiiii:<<

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1. a) (7$\frac{4}{9}$ + 4$\frac{7}{11}$) – 3$\frac{4}{9}$ 

   = 67/9 + 51/11 – 31/9

   = (67/9 – 31/9) + 51/11

   = 36/9 + 51/11

   = 4 + 51/11

   = 95/11

   b) 7$\frac{5}{11}$ – (2$\frac{3}{7}$) + 3$\frac{5}{11}$)

   = 82/11 – 17/7 – 38/11

   = (82/11 – 38/11) – 17/7

   = 44/11 – 17/7

   = 4 – 17/7

   = 11/7

   c) 7$\frac{5}{9}$ + (2$\frac{3}{4}$) – 3$\frac{5}{9}$)

   = 68/9 + 11/4 – 32/9

   = (68/9 – 32/9) + 11/4

   = 36/9 + 11/4

   = 4 + 11/4

   = 27/4

    

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2. a) (7$\frac{4}{9}$ + 4$\frac{7}{11}$) – 3$\frac{4}{9}$ 

   = ($\frac{67}{9}$ – $\frac{31}{9}$)  + $\frac{51}{11}$

   = 4 + $\frac{51}{11}$

   = $\frac{44+51}{11}$ = $\frac{95}{11}$

   b) 7$\frac{5}{11}$ – (2$\frac{3}{7}$ + 3$\frac{5}{11}$) 

   =  $\frac{-17}{7}$ + ($\frac{82}{11}$ – $\frac{38}{11}$) 

   = $\frac{-17}{7}$ + 4

   = $\frac{-17+28}{7}$ = $\frac{11}{7}$

   c) 7$\frac{5}{9}$ + (2$\frac{3}{4}$ – 3$\frac{5}{9}$) 

   = $\frac{11}{4}$ + ($\frac{68}{9}$ – $\frac{32}{9}$) 

   = $\frac{11}{4}$ + 4

   = $\frac{11+16}{4}$ = $\frac{27}{4}$

    

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