c)ma=( 5+7,2)/2=12,2/2=6,1
mg=√5×7,2=√36=6
mh=(2×5×7,2)/5+7,2=72:12,2=5,9
5,9<=mg<=6,1
d)ma=40√3/2=20√3
mg=√28×12×3=√4×7×4×3×3=12√7
mh=672/40√3=336√3/20=84√3/5
29,04<=31,68<=34,6
e)ma=(√2+2√2)/2=3√2/2
mg=√16=4
mh=2√2×√8/3√2=8√2/3
3,76<=4<=2,11 fais
f)1 intreg 1/7=8/7
3/125
ma=(8/7+3/125):2=(125×8+3×7)/250=1021/250=4,082
mg=√8/7×3/125=√4×6/35×25=2√6/5√35=0,.....
mh=(48/875):1021/125=48/875×125/1021=48/(7×1021)=0,0006
mh<=mg<=ma