89쪽:89쪽3/4+(1과2분의1-0.8)X2÷1과5분의2= 3/4+7/10X2÷1과5분의2= 3/4+1과5분의2÷1과5분의2=3/4+1=1과4분의32와5분의4÷(4/3X1/2-1/3)-2.4=2와5분의4X3/
당신은 어느 그룹입니까?