Question

1) calculati:
a) (4+2³:4)*(-5)²*1,25=...
b) (-2)³ *0,8+(-1) la puterea 2013=....
c) √38(8/√3+7/√27)=...

Answer 1

a) (4+8:4)*25*1,25=(4+2)*25*1,25=6*25*1,25=150*1,25=187,5
b) -8*0,8-1=-6,4-1=-7,4
c) rationalizam 8/√3 cu √3 iar 7/3√3 cu √3
√38(8√3/3+7√3/9)= (amplificam 8√3/3 cu 3)        
=√38(24√3/9+7√3/9)
=√38*31√3/9
=31√114/9