28/25 + 17/19 - 3/25 + 0 , 9 + 2/19
= ( 28/25 - 3/25 ) + ( 17/19 + 2/19 ) - 3/25 + 0 , 9
= 25/25 + 19/19 - ( 12/100 - 90/100 )
= 1 + 1 - 102/100
= 2 - 102/100
= 200/100 - 102/100
= 98/100
= 49/50
Chúc bạn học tốt !!! Tk mk nếu đúng !!!
\(\frac{28}{25}\)+\(\frac{17}{19}\)-\(\frac{3}{25}\)+ 0,9 +\(\frac{2}{19}\)
= (\(\frac{28}{25}\)+\(\frac{3}{25}\)) - (\(\frac{17}{19}\)+\(\frac{2}{19}\)) + 0,9
= \(\frac{31}{25}\)- 1 + 0,9
= \(\frac{6}{25}\)+ 0,9
= \(\frac{57}{50}\)
Bạn natsu ơi làm gì có 2 cái 3/25
