[질문] Rpm 6-2 76~80답이요

76번3.36m,77번13.3kg,78번185.2cm,79번4.5+1.5*(2와3분의1-0.4)=7.4,80⑴2*(4분의3+4.2)-2와2분의1*0.6=8과5분의2⑵ 2*4분의3+(4.2-2와2분의1)*0.6=2와25분의13