Bonjour, pourriez-vous m’aidez à mon dm de maths s’il vous plait Merci beaucoup !!

bonsoir

i=(9/15+3/10)=
       18/30+9/30=
          27/30=
           9/10
et 9/10:6/5=
    9/10*5/6=
       45/60=
        3/4

j =12/7-4/7*35/12
  4/7*35/12=140/84=5/3
et 12/7-5/3=
     36/21-35/21= 1/21

k=(4/5+7/10)=
      8/10+7/10=
       15/10=3/2

(5/6-5/8)=
20/24-15/24=
  5/24
et 3/2:5/24=
3/2*24/5=
72/10=
36/5

l =6/5+21/5:14/15
21/5:14/15=
21/5*15/14=
315/70=
9/2
 et 6/5+9/2=
       12/10+45/10=
        57/10

* veut dire multiplier
: veut dire diviser

Bonsoir,
Voilà,J’ai calculer 3 et Je vous laisse la dernière (même méthode) :)[tex]\frac{ \frac{9}{15}+ \frac{3}{10}}{ \frac{6}{5}} = \frac{ \frac{18+9}{30}}{ \frac{6}{5}}= \frac{27}{30} . \frac{5}{6} = \frac{135}{180} = \frac{3}{4} \\ \\[tex] \\ \\ \frac{ \frac{9}{15}+ \frac{3}{10}}{ \frac{6}{5}} = \frac{ \frac{18+9}{30}}{ \frac{6}{5}}= \frac{27}{30} . \frac{5}{6} = \frac{135}{180} = \frac{3}{4} \\ \\ \frac{12}{7} - \frac{4}{7} . \frac{35}{12}= \frac{12}{7} - \frac{140}{84}= \frac{144}{84} - \frac{140}{84} = \frac{4}{84} = \frac{1}{21} \\ \\ \frac{ \frac{4}{5} +\frac{7}{10} }{ \frac{6}{5} -\frac{5}{8} }= \frac{ \frac{15}{10}}{ \frac{23}{40}}= \frac{15}{10} . \frac{40}{23} = \frac{600}{230}= \frac{60}{23} [/tex][tex] \\ \\ \frac{ \frac{9}{15}+ \frac{3}{10}}{ \frac{6}{5}} = \frac{ \frac{18+9}{30}}{ \frac{6}{5}}= \frac{27}{30} . \frac{5}{6} = \frac{135}{180} = \frac{3}{4} \\ \\ \frac{12}{7} - \frac{4}{7} . \frac{35}{12}= \frac{12}{7} - \frac{140}{84}= \frac{144}{84} - \frac{140}{84} = \frac{4}{84} = \frac{1}{21} \\ \\ \frac{ \frac{4}{5} +\frac{7}{10} }{ \frac{6}{5} -\frac{5}{8} }= \frac{ \frac{15}{10}}{ \frac{23}{40}}= \frac{15}{10} . \frac{40}{23} = \frac{600}{230}= \frac{60}{23} [/tex] \frac{12}{7} - \frac{4}{7} . \frac{35}{12}= \frac{12}{7} - \frac{140}{84}= \frac{144}{84} - \frac{140}{84} = \frac{4}{84} = \frac{1}{21} \\ \\ \frac{ \frac{4}{5} +\frac{7}{10} }{ \frac{6}{5} -\frac{5}{8} }= \frac{ \frac{15}{10}}{ \frac{23}{40}}= \frac{15}{10} . \frac{40}{23} = \frac{600}{230}= \frac{60}{23} [/tex][tex]\frac{ \frac{9}{15}+ \frac{3}{10}}{ \frac{6}{5}} = \frac{ \frac{18+9}{30}}{ \frac{6}{5}}= \frac{27}{30} . \frac{5}{6} = \frac{135}{180} = \frac{3}{4} \\ \\ \frac{12}{7} - \frac{4}{7} . \frac{35}{12}= \frac{12}{7} - \frac{140}{84}= \frac{144}{84} - \frac{140}{84} = \frac{4}{84} = \frac{1}{21} \\ \\ \frac{ \frac{4}{5} +\frac{7}{10} }{ \frac{6}{5} -\frac{5}{8} }= \frac{ \frac{15}{10}}{ \frac{23}{40}}= \frac{15}{10} . \frac{40}{23} = \frac{600}{230}= \frac{60}{23} [/tex]

[tex]\frac{ \frac{9}{15}+ \frac{3}{10}}{ \frac{6}{5}} = \frac{ \frac{18+9}{30}}{ \frac{6}{5}}= \frac{27}{30} . \frac{5}{6} = \frac{135}{180} = \frac{3}{4} \\ \\ \frac{12}{7} - \frac{4}{7} . \frac{35}{12}= \frac{12}{7} - \frac{140}{84}= \frac{144}{84} - \frac{140}{84} = \frac{4}{84} = \frac{1}{21} \\ \\ \frac{ \frac{4}{5} +\frac{7}{10} }{ \frac{6}{5} -\frac{5}{8} }= \frac{ \frac{15}{10}}{ \frac{23}{40}}= \frac{15}{10} . \frac{40}{23} = \frac{600}{230}= \frac{60}{23} [/tex][tex] \\ \\ \frac{ \frac{9}{15}+ \frac{3}{10}}{ \frac{6}{5}} = \frac{ \frac{18+9}{30}}{ \frac{6}{5}}= \frac{27}{30} . \frac{5}{6} = \frac{135}{180} = \frac{3}{4} \\ \\ \frac{12}{7} - \frac{4}{7} . \frac{35}{12}= \frac{12}{7} - \frac{140}{84}= \frac{144}{84} - \frac{140}{84} = \frac{4}{84} = \frac{1}{21} \\ \\ \frac{ \frac{4}{5} +\frac{7}{10} }{ \frac{6}{5} -\frac{5}{8} }= \frac{ \frac{15}{10}}{ \frac{23}{40}}= \frac{15}{10} . \frac{40}{23} = \frac{600}{230}= \frac{60}{23} [/tex]