11. Zamień ułamki dziesiętne na ułamki zwykłe i oblicz: a) 2/3+0,25= b) 0,75-5/7= c) 2 2/3:0,32= d) 2,7*1 1/9= daje naj :D proszę o odpowiedz na dzisiaj 02.09

2/3 + 0,25 =  2/3 + 25/100 = 200/300 + 75/300 = 275/300 = 55/60 = 11/12 0,75 - 5/7 = 75/100 - 5/7 = 525/700 - 500/700 = 25/700 = 1/28 2 2/3 : 0,32 = 8/3 : 32/100 = 8/3 * 100/32 = 100/12 = 8 4/12 = 8 1/3 2,7 * 1 1/9 = 2 7/10 * 1 1/9 = 27/10 * 10/9 = 3

a) [latex] frac{2}{3} + 0,25 = frac{2}{3} + frac{1}{4} = frac{8}{12} + frac{3}{12} = frac{11}{12} [/latex] b) [latex]0,75 - frac{5}{7} = frac{3}{4} - frac{5}{7} = frac{21}{28} - frac{20}{28} = frac{1}{28} [/latex] c) [latex]2 frac{2}{3} : 0,32= frac{8}{3} : frac{32}{100} = frac{8}{3} : frac{8}{25} = frac{8}{3} * frac{25}{8} = frac{25}{3} =8 frac{1}{3} [/latex] d) [latex]2,7 * 1 frac{1}{9} = frac{27}{10} * frac{10}{9} = 3[/latex]