간편 연산,7/15*0.8+8/15*0.18

간편 연산,7/15*0.8+8/15*0.18

7/15*0.8+8/15*0.18
=1/15x(7x0.8+8x0.18)
=1/15x(0.56+1.44)
=1/15x2
=2/15