14. b) 5/7 + 7/5 = 25/35 + 49/35 = 2 4/35 TAK c) 1 1/8 + 3/4 = 9/8 + 3/4 = 9/8 + 6/8 = 15/8 = 1 7/8 TAK d) 1 1/6 + 2/9 = 7/6 + 2/9 = 21/18 + 4/18 = 25/18 = 1 7/18 NIE 15. a) 3/4 - 2/3 = 9/12 - 8/12 = 1/12 NIE b) 8/7 - 7/9 = 72/63 - 49/63 = 23/63 NIE c) 2 3/5 - 16/7 = 13/5 - 16/7 = 91/35 - 80/35 = 11/35 NIE d) 23/5 - 3 5/6 = 23/5 - 23/6 = 78/30 - 115/30 = -37/30 NIE 16. a) 2 2/3 - 5 1/4 + 0,75 = 8/3 - 21/4 + 3/4 = 24/12 - 63/12 + 9/12 = -30/12 = - 2 1/2 b) 1 7/12 + 1 5/6 - 1/2 : 2/3 = 19/12 + 11/6 - 1/2 * 3/2 = 19/12 + 11/6 - 3/4 = 19/12 + 22/12 - 9/12 = 50/12 = 4 2/12 = 4 1/6 c) -3,625 - 7 3/4 + 3 1/2 : ( -1 1/3) = -3 5/8 - 7 3/4 + 3 1/2 * (- 4/3 ) = -29/8 - 31/4 + 7/2 * (-3/4) = -29/8 - 31/4 - 21/8 = -29/8 - 62/8 - 21/8 = -112/8 Mam nadzieję, że pomogłam i jest dobrze. Liczę na naj!
Zad.14 b)[latex] frac{25}{35} + frac{49}{35} = frac{74}{35} = 2 frac{4}{35} [/latex] NIE c)[latex]1 frac{1}{8} + frac{6}{8} = 1 frac{7}{8} [/latex] NIE d)[latex] frac{7}{6} + frac{2}{9} = frac{21}{18} + frac{4}{18} = frac{25}{18} = 1 frac{7}{18} [/latex] NIE Zad.15 a)[latex] frac{9}{12} - frac{8}{12} = frac{1}{12} [/latex] TAK b)[latex] frac{81}{63} - frac{49}{63} = frac{32}{63} [/latex] NIE c)[latex] frac{13}{5} - frac{16}{7} = frac{91}{35} - frac{80}{35} = frac{11}{35} [/latex] TAK d)[latex] frac{138}{30} - frac{115}{30} = frac{23}{30} [/latex] NIE Zad.16 c)[latex]-3 frac{5}{8} - 7 frac{3}{4} + 3 frac{1}{2} : (-1 frac{1}{3}) = - frac{24}{8} - frac{62}{8} + frac{28}{8} * ( -frac{1}{3} ) = - frac{86}{8} + (- frac{28}{24}) = - frac{258}{24} + (- frac{28}{24}) = -frac{286}{24} = -11 frac{22}{24} [/latex] Chyba dobrze ...