간편 계산(55+5/8)*1/5 8/9*102-16/9

간편 계산(55+5/8)*1/5 8/9*102-16/9

(55+5/8)*1/5
=5*(11+1/8)*1/5
=11+1/8
=11 과 1/8
8/9*102-16/9
=[8*(100+2)-2*8]/9
=(800+2*8-2*8)/9
=800/9
=88 과 8/9