Question

Calculati:
a) [6√7•(-2√7)]•(2/3•√3)
b) (-5/3√3)•(-18/128√2)•(-5/7√72)

Answer 1

a)[6√7*(-2√7)]*(2√3*√3)=
=(-12*7)*(2*3)=
=-84*6=
=-504

b)(-5/3√3)*(-18/128√2)*(2/7√72)=
=(-5/3√3)*(-9/64√2)*(2/6*7√2)=(simplificam 2 cu 6)
=(-5/3√3)*(-9/64√2)*(1/21√2)=
rationalizam numitorii
=5√3/9*9√2/128*√2/42=
=(5√3*9√2*√2)/(9*128*42)=
=(5√3*18)/(9*128*42)=
=(5√3*2)/(128*42)(am simplificat 9 cu 18)=
=5√3/64*42(am simplificat 2 cu 128)=
=5√3/2688