Bonjour,
A : 3x5-(5-12)
= 3x5-(-7)
=15-(-7)
=15+7
=22
B : 5-(3-5x6)
= 5-(3-30
=5-(-27)
=5+27
=32
C : 4x(2-3x9)+7
=4x(2-27)+7
=4x(-25)+7
=-100+7
=-93
D :9x(-2-4x5)-3
=9x(-2-20)-3
=9x(-22)-3
=-198-3
=-201
E : -63÷(2-3x7+5x2)-11
=-63÷(2-21+5x2)-11
=-63÷(2-21+10)-11
=-63÷(-19+10)-11
=-63÷(-9)-11
=7-11
=-4
F : 48÷(2-12÷4-7)-4
= 48÷(2-3-7)-4
=48÷(-1-7)-4
=48÷(-8)-4
=-6-4
=-10
Voilà .-.