1.
a)
[tex] \frac{1}{4} + \frac{2}{3} + \frac{1}{6} = \frac{3}{12} + \frac{8}{12} + \frac{2}{12} = \frac{13}{12} = 1 \frac{1}{12} [/tex]
b)
[tex]1 \frac{5}{7} + 2 \frac{3}{4} = 1 \frac{20}{28} + 2 \frac{21}{28} = 3 \frac{41}{28} = 4 \frac{13}{28} [/tex]
c)
[tex] \frac{7}{8} - \frac{3}{4} = \frac{7}{8} - \frac{6}{8} = \frac{1}{8} [/tex]
d)
[tex]2 \frac{1}{3} - 1 \frac{3}{5} = 2 \frac{5}{15} - 1 \frac{9}{15} = 1 \frac{20}{15} - 1 \frac{9}{15} = \frac{11}{15} [/tex]
2.
A
[tex] \frac{2}{3} + \frac{5}{6} = \frac{4}{6} + \frac{5}{6} = \frac{9}{6} = 1 \frac{3}{6} = 1 \frac{1}{2} [/tex]
Prawda
B
[tex] \frac{3}{4} - \frac{1}{2} = \frac{3}{4} - \frac{2}{4} = \frac{1}{4} [/tex]
Fałsz
C
[tex]1 \frac{1}{4} - \frac{1}{3} = 1 \frac{3}{12} - \frac{4}{12} = \frac{15}{12} - \frac{4}{12} = \frac{11}{12} [/tex]
Prawda
D
[tex]6 \frac{1}{2} - 4 \frac{3}{4} = 6 \frac{2}{4} - 4 \frac{3}{4} = 5 \frac{6}{4} - 4 \frac{3}{4} = 1 \frac{3}{4} [/tex]
Prawda
Zdanie fałszywe to zdanie B
