Как разделить -48 3/4:3.9

- 48 целых 3 / 4 : 3.9 = - ( 48 * 4 + 3 ) / 4 / 3,9 = - ( 192 + 3 ) / 4 / 3,9 = - 195 / 4 / 3,9 = - 195 / 4 / ( 3 целых 9 / 10 ) = - 195 / 4 / ( ( 3 * 10 + 9 ) / 10 ) = - 195 / 4 / ( ( 30 + 9 ) / 10 ) = - 195 / 4 / ( 39 / 10 ) = - 195 / 4 * ( 10 / 39 ) = - ( 195 * 10 ) / ( 4 * 39 ) = - 5 * 39 * 10 / ( 4 * 39 ) = - 5 * 1 * 10 / ( 4 * 1 ) = - 5 * 10 / 4 = - 5 * 2 * 5 / ( 2 * 2 ) = - 5 * 5 * 1 / ( 2 * 1 ) = - 5 * 5 / 2 = - 25 / 2.