1.(3/1+5/4-6/5)/30/1 2,4.5-(5/1+1.5)-5/4 3,2.5*(10/9+10/9+10/9+10/9+10/9 간편 연산

1.(3/1+5/4-6/5)/30/1 2,4.5-(5/1+1.5)-5/4 3,2.5*(10/9+10/9+10/9+10/9+10/9 간편 연산

1:원 식=[3+(5*5-4*6)/20]/30=(3+1/20)/30=61/600
2:원 식=4.5-5-1.5-5/4=(4.5-1.5)-5-4=-2-5/4=-3.25
3:원 식=2.5*10/9*4=(2.5*4)*10/9=10*10/9=100/9