Bonjour !
1. a)
[tex]A = \frac{\frac{5}{2} * \frac{3}{4} +1 }{\frac{1}{10} + \frac{7}{5} } \\\\A= \frac{\frac{15}{8} +1 }{\frac{5}{50} + \frac{70}{50} } \\\\A= \frac{\frac{15}{8} +\frac{8}{8} }{\frac{75}{50} } \\\\A= \frac{\frac{23}{8}}{\frac{75}{50} } \\\\A= \frac{23}{8} * \frac{50}{75} \\\\A= \frac{1150}{600} \\\\A= \frac{1150 : 50}{600:50} \\\\A= \frac{23}{12}[/tex]
b) [tex]\frac{23}{12} = 1,917[/tex]
2. a)
[tex]B = (2^2+7035^0)^3-(2^4+7,5)^2\\B= (4+1)^3-(16+7,5)^2\\B=5^3-23,5^2\\B=125-552,25\\B=-427,25\\[/tex]
b. [tex]-427,25 = -4,2725 * 10^2[/tex]
Voilà !
