Sagot :
1 > A= (2(-2)+1) /-2 -( -2) / 2(-2)+1=
= (-4+1) /-2 - ( -2) / -4+1 = 3/2 -2/3 = 9/6 -4/6 = 5/6
B > [ 2 ( +5) +3 ] - [ 2-5(+5)] =
10+3-2+25= 38-2=36
2 > C= 6+2a+4+8a-6a+2a = 12a+4
D = 2a+6a-3-9a-9-6a = -7a-12
3> E = 5x^2 ( x-5) 5x^2 veut dire 5 x au carré
F = ( 3x-1) (3+4x)
et voilà