Question

AJUDA

a) (2/3 +1/6).(1/10+7/20)
b) 1/5 - 2/3 sobre 4/5+1

Answer 1

(2/3 •2+1/6)•(1/10•2+7/20)=
(4/6+1/6)•(2/20+7/20)=
5/6•9/20=
45/120

obs:eu não consegui resolver a letra b