oblicz 5 3/5+11 2/7
6 2/9-2 2/3
8-4 7/11



Franek kupiłem 1,2kg jabłek,których 1kg kosztował 2,60zł ile zapłacił


oblicz 15-(-13)-15+6
3/5+2/3-0,6-2/3+5/6



Odpowiedź :

Odpowiedź:

5 i 3/5 + 11 i 2/7 = 5 i 21/35 + 11 i 10/35 = 16 i 31/35

6 i 2/9 - 2 i 2/3 = 6 i 2/9 - 2 i 6/9 = 5 i 11/9 - 2 i 6/9 = 3 i 5/9

8 - 4 i 7/11 = 7 i 11/11 - 4 i 7/11 = 3 i 4/11

1,2 kg * 2,60 zł = 3,12 zł ----- tyle Franek zapłacił  za jabłka

15 - (-13) - 15 + 6 = 15 + 13 - 15 + 6 = 28 - 15 + 6 = 19

3/5 + 2/3 - 0,6 - 2/3 + 5/6 = 3/5 + 2/3 - 6/10 - 2/3 + 5/6 = 18/30 + 20/30 - 18/30 - 20/30 + 25/30 = 38/30 - 18/30 + 25/30 = 20/30 + 25/30 = 55/30 = 1 i 15/30 = 1 i 3/6 = 1 i 1/2

Odpowiedź:

[tex]5 \frac{3}{5} + 11 \frac{2}{7} = 5 \frac{21}{35} + 11 \frac{10}{35} = 16 \frac{31}{35} \\ \: 6 \frac{2}{9} - 2 \frac{2}{3} = 6 \frac{2}{9} - 2 \frac{6}{9} = 5 \frac{11}{9} - 2 \frac{6}{9} = 3 \frac{5}{9} \\ \: 8 - 4 \frac{7}{11} = 3 \frac{4}{11}[/tex]

2.

[tex]1kg = 2.60zl \\ 0.2kg = xzl \\ 1x = 2.60 \times 0.2 \\ 1x =0.52\div 1 \\ x = 0.52 \\ 2.60zl + 0.52zl = 3.12zl[/tex]

3.

[tex]13 + 6 \frac{3}{5} + \frac{2}{3} - \frac{3}{5} - \frac{2}{3} + \frac{5}{6} = 19 \frac{3}{5} + \frac{2}{3} - \frac{3}{5} - \frac{2}{3} + \frac{5}{6} = 19 \frac{9}{15} + \frac{10}{15} - \frac{9}{15} - \frac{10}{15} + \frac{5}{6} = 19 + \frac{5}{6} = 19 \frac{5}{6} [/tex]