[tex]a)\\\\1\frac{3}{4}+ 8,7 =1\frac{3}{4}+ 8 \frac{7 }{10}=1\frac{15}{20}+ 8 \frac{14 }{20}=9\frac{29}{20}=10\frac{9}{20}\\\\b)\\\\4,9 - 2 \frac{2}{5}=4\frac{9}{10}-2\frac{4}{10}=2\frac{5}{10}=2\frac{1}{2}\\\\c)\\\\3\frac{1}{9} + 2,1 =3\frac{1}{9} + 2\frac{1}{10} =3\frac{10}{90} + 2\frac{9}{90}=5\frac{19}{90}[/tex]
[tex]d)\\\\ \frac{1}{8}- \frac{4}{2}=\frac{1}{8}-2=-1\frac{7}{8}\\\\e)\\\\3\frac{4}{5} : 0,5=\frac{19}{5}:\frac{5}{10}=\frac{19}{5}:\frac{1}{2}=\frac{19}{5}*\frac{2}{1}=\frac{38}{5}\\\\f)\\\\2,6 - 1\frac{1}{6}=2\frac{6}{10} -1\frac{1}{6}=2\frac{18}{30} -1\frac{5}{30}=1\frac{13}{30}[/tex]
Odpowiedź:
Szczegółowe wyjaśnienie:
1 3/4 + 8,7 = 4/4 + 3/4 + 87/10 = 7/4 + 174/20 = 35/20 + 174/20 =
= 209/20 = 10 + 9/20 = 10i9/20 (10 całych i 9/20)
4,9 - 2 2/5 = 49/10 - 20/10 - 4/10 = 25/10 = 5/2 = 4/2 + 1/2 = 2i1/2
3 1/9 + 2,1 = 27/9 + 1/9 + 21/10 = 28/9 + 21/10 = 280/90 + 189/90 =
469/90 = 5 + 19/90 = 5i19/90 (5 całych i 19/90)
1/8 - 4/2 = 1/8 - 16/8 = 15/8 = 8/8 + 7/8 = 1 + 7/8 = 1i7/8
3 4/5 : 0,5 = (15/5 + 4/5):5/10 = (19/5)⋅10/5 = 19⋅2/5 = 38/5 =
7 + 3/5 = 7 3/5
2,6 - 1 1/6 = 26/10 - 11/6 = 78/30 + 55/30 = 133/30 =
4 + 13/30 = 4 13/30