a et b désignent des nombres tel que : ab= -3 et a+b = -0,5 calculer : A = (a+1)(b+1) B = (a+10)(b+10) C = (a-0,1)(b-0,1) D = (2a-5)(2b-5)

A= ab+a+b+1
A= -3-0.5+1
A= -2.5

B= ab+10a+10b+100
B= -3+10(a+b)+100
B= -3+10*(-0.5)+100
B= -3-5+100
B= 92

C= ab-0.1a-0.1b+0.01
C= -3-0.1(a+b)+0.01
C= -3-0.1*(-0.5)+0.01
C= -3+0.05+0.01
C= -2.94

D= 4ab-10a-10b+25
D= 4*(-3)-10(a+b)+25
D= -12-10(-0.5)+25
D= -12+5+25
D= 18