Sagot :
Question 3 :
A=-2
(2-2+3)(4-2-7)+4(-2)*+12-2+9
=3x(-5)+4x4+19
=-15+8+19
=12.
A=-3/2
(-2-3/2+3)(4-3/2-7)+4(-3/2)*+12-3/2+9
=(4/2-3/2+6/2)(8/2-3/2-14/2)+4x(-9/4)+24/2+18/2
=7/2x(-9/2)+36/4+42/2
=-63/4+36/4+84/4
=57/4 ou 14,25.