Question

Calculați:
(-5/2)•{18-[0,(3)+2/7(4/3-3/2)]la puterea 2: (-0,05)}

Answer 1

(-5/2)•{18-[0,(3)+2/7(4/3-3/2)]²: (-0,05)}==(-5/2)•{18-[3/9+2/7(8-9)/6)]²: (-5/100)}=
=(-5/2)•{18-[1/3+2/7×(-1/6)]²: (-1/20)}=
=(-5/2)•{18-[1/3-2/42)]² × (-20)}=
=(-5/2)•{18-[1/3-1/21)]² × (-20)}=
={18-[(7-1)/21]²× 50}=
={[18-(6/21)²]× 50}=
=[18-(2/7)²]× 50=
=(18-4/49)× 50=
=(882-4)/49 ×50=
=878/49 x50=
=43900/49