(5 + 5) * 5 + 5 = 10 * 5 + 5 = 50 + 5 = 55
48×30=1440,49×30=1470,50×30=1500,51×30=1530,52×30=1560
Решение
(24(4/5) - 19,5 )/ 7(2/9) = [5(3/10)] / 7(2/9) = 477/650
или
24(4/5) - 19,5 / 7(2/9) = 24,8 - (195/10) / (65/9) = 24,8 - (195*9)/(10*65) =
2,8 - (195/10)*(9/65) = 2,8 - (195*9)/(10*65) = 2,8 - 27/10 = 2,8 - 2,7 = 0,1
0,8√54,76 +9/10×√2,25 -√62,41=0,8*7,4+9/10*1,5-7,9=5,92+1,35-7,9=
=7,27-7,9=-0,63