Question

calculați aducând reactiile la acelasi numitor: a ) 18 supra 7 - 5 supra 3 ,b)18supra 5 -4 supra 9,c)9 supra 15 -7 supra 45,d)38 supra 18 -17 supra 9 ,e ) 47 supra 12 -23 supra 14,f) 31 supra 15 - 19supra 30

Answer 1

$a) \frac{18}{7} - \frac{5}{3} = \frac{54 }{21} - \frac{35}{21} = \frac{54 - 35}{21} = \frac{19}{21}$

$b) \frac{18}{5} - \frac{4}{9} = \frac{162}{45} - \frac{20}{45} = \frac{162 - 20}{45} = \frac{142}{45}$

$c) \frac{9}{15} - \frac{7}{45} = \frac{27}{45} - \frac{7}{45} = \frac{27 - 7}{45} = \frac{20}{45} = \frac{4}{9}$

$d) \frac{38}{18} - \frac{17}{9} = \frac{38}{18} - \frac{34}{18} = \frac{38 - 34}{18} = \frac{4}{18} = \frac{2}{9}$

$e) \frac{47}{12} - \frac{23}{14} = \frac{329}{84} - \frac{138}{84} = \frac{329 - 138}{84} = \frac{191}{84}$

$f) \frac{31}{15} - \frac{19}{30} = \frac{62}{30} - \frac{19}{30} = \frac{62 - 19}{30} = \frac{43}{30}$

Answer 2

Mult succes în continuare!