Sagot :
Bonjour,
a) 1+-15/7+-3/5
1- 75/35 - 21/35=
1-96/35
35/35 - 96/35 = -61/ 35
b) 1-8/5-(-3/2--7/10)
1- 8/5 -( -15/10 +7/10)=
1-8/5 -( -8/10) =
1-8/5 +8/10=
10/10 -16/10 +8/10 = 2/10 = 1/5
Bonjour
[tex]1 - \frac{15}{7} - \frac{3}{5} = \\ \frac{7}{7} - \frac{15}{7} - \frac{3}{5} = \\ \frac{ - 8}{7} - \frac{3}{5} = \frac{ - 40}{35} - \frac{21}{35} = \\ \frac{61}{5} [/tex]
[tex] \frac{5}{5} - \frac{8}{5} - ( \frac{ - 15}{10} + \frac{7}{10} ) \\ = \frac{ - 3}{5} + \frac{8}{10} \\ = \frac{ - 3}{5} + \frac{4}{5} \\ = \frac{1}{5} [/tex]