Question

calculeaza,scriind rezultatul sub forma cea mai simpla: 8 supra 14 plus 2 supra 7; 2 supra 3 plus 5 supra 4;17 supra 6 minus 5 supra 3; 7 supra 15 plus 9 supra 20; 5 supra 2 plus 3; 4 plus 8 supra 3;1 minus 7 supra 5;1 supra 3 plus 1 supra 6 plus 1 supra 12; 7 supra 10 minus 2 supra 15 minus 7 supra 30; 17 supra 4 minus 3.....VA rog repede maine trebuie sa duc tema,va rog frumos:)))) (sunt mai multe calcule,nu doar una) dau coroana

Answer 1

a) $\frac{8}{14}+\frac{2}{7} = \frac{8}{14}:\quad \frac{4}{7} = \frac{8}{14}:\quad \frac{4}{7} = \frac{4+2}{7} = \frac{6}{7}$

b)$\frac{2}{3}+\frac{5}{4} = \frac{8}{12}+\frac{15}{12} =  \frac{8+15}{12} = \frac{23}{12}$

c)$\frac{17}{6}-\frac{5}{3} =\frac{17}{6}-\frac{10}{6} =\frac{17-10}{6} =\frac{7}{6}$

d) $\frac{7}{15}+\frac{9}{20} =\frac{28}{60}+\frac{27}{60} =\frac{28}{60}+\frac{27}{60} =\frac{55}{60} =\frac{11}{12}$

e)$\frac{5}{2}+3 =\frac{3\cdot \:2}{2}+\frac{5}{2} =\frac{3\cdot \:2+5}{2} =\frac{3\cdot \:2+5}{2} =\frac{11}{2}$

f) $4+\frac{8}{3} =\frac{4\cdot \:3}{3}+\frac{8}{3} =\frac{4\cdot \:3+8}{3} =\frac{20}{3}$

g) $1-\frac{7}{5}  =\frac{1\cdot \:5}{5}-\frac{7}{5}  =\frac{1\cdot \:5-7}{5} =\frac{-2}{5} =-\frac{2}{5}$

i )  $\frac{1}{3}+\frac{1}{6}+\frac{1}{12}  =\frac{4}{12}+\frac{2}{12}+\frac{1}{12} =\frac{4+2+1}{12} =\frac{7}{12}$

j) $\frac{7}{10}-\frac{2}{15}-\frac{7}{30}  =\frac{21}{30}-\frac{4}{30}-\frac{7}{30} =\frac{21-4-7}{30} =\frac{10}{30} =\frac{1}{3}$

k) $\frac{17}{4}-3 =-\frac{3\cdot \:4}{4}+\frac{17}{4}  =\frac{-3\cdot \:4+17}{4} =\frac{5}{4}$

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