Răspuns:a) √5·√30=√5·√(5·3·2)=√5·√5·√3·√2=(√5·√5)·(√3·√2)=5·√6
b) √2·√18=√2·√(2·3·3)=√2·√2·√3·√3=(√2·√2)·(√3·√3)=2·3=6
c) √80·√(1/5)=√(80 · 1/5)=√16=4
d) √0,08·√0,18=√(0,08·0,18)=√0,0144=√144/10000=√144/√10000=12/100=0,12
e) √3,2·√0,8=√(3,2 · 0,8)=√2,56=1,6
f) √(9/10)·√(40/81)=√(9/10 · 40/81)=√(9·40)/(10·81)=√(4/9)=√4:√9=2/3
Explicație pas cu pas: