两种方法
(1)都化作假分数,即原式={9/2+【-9*1/9-4/5】}/(-27/5)= -(9/2-9/5)*5/27=-45/54+1/3=18/54-45/54=-27/54=-1/2
(2)都化作小数.即原式=(4.5+【-1-0.8】)/(-5.4)=2.7/(-5.4)=-0.5
两种方法
(1)都化作假分数,即原式={9/2+【-9*1/9-4/5】}/(-27/5)= -(9/2-9/5)*5/27=-45/54+1/3=18/54-45/54=-27/54=-1/2
(2)都化作小数.即原式=(4.5+【-1-0.8】)/(-5.4)=2.7/(-5.4)=-0.5