2,04÷0,19-2,5*0,9=51/25 ÷ 19/100 -2,25= 51/25 × 100/19 - 9/4 = 204/19 - 9/4 = 645/76= 8 37/76
(1/6-5/3×1/5)×20/3+1/5=(1/6-1/3)×20/3+1/5=-1/3÷10/3+1/5=-10/9+1/5=-41/45=-0,91
2,04÷0,19-2,5*0,9=51/25 ÷ 19/100 -2,25= 51/25 × 100/19 - 9/4 = 204/19 - 9/4 = 645/76= 8 37/76
(1/6-5/3×1/5)×20/3+1/5=(1/6-1/3)×20/3+1/5=-1/3÷10/3+1/5=-10/9+1/5=-41/45=-0,91