Bonjour
A= 30-(2-7*3)
A= 30-2+7*(-3)
A= 28-21= 7
B=[tex]( \frac{-3-12}{4} ) - \frac{39}{3+5} = \frac{-15}{4} - \frac{39}{8} = \frac{-15*2}{4*2} - \frac{39}{8}
= \frac{30}{8} - \frac{39}{8} = \frac{-9}{8} [/tex]
C= 8+[(-3-(-11+6-7))]
C= 8+[(-3+(11-6+7))]
C= 8+(-3+12)
C= 8+9= 17
D= [tex] \frac{3-15}{3} + \frac{12}{4} + 2*(-1)
[/tex]
D= [tex] \frac{-12}{3} + \frac{12}{4} - \frac{2}{1} [/tex]
D= [tex] \frac{12*4}{3*4} + \frac{12*3}{3*4} - \frac{2*12}{1*12} [/tex]
D= [tex] \frac{48}{12} + \frac{36}{12} - \frac{24}{12} [/tex]
D= [tex] \frac{60}{12} = \frac{10*6}{6*2} [/tex]
D= [tex] \frac{10}{2} [/tex] = 5