Răspuns :
Salut!
a=(3,5+0,5)(3,5-0,5)
a=4,0 3,0
a=12
b=(0,12)3:0,13+0,23×103
b=0,36:0,13+23,69
b=0,32+23,69
b=24.01
A=12
B=24.01
A<B
12<24.01
Nu sunt sigur ca la B e corect...
a=7×3 = 21
b=0,36:0,13+0,23= 2,7692307692 + 0,23=2,9992307692
a>b = 21>2,9992307692