Question

4,2:(2,25-1целая7/8*3целых1/3)

Answer 1

4,2:(2,25-1целая7/8*3целых1/3) = - 1,05
                                                              5 * 5             25
1)  1целая7/8*3целых1/3 = 15/8 * 10/3 = -------------- = ---------- = 6,25
                                                               4 * 1             4

2) 2,25 - 6,25 = - 4
3) 4,2 :(-4) = - 1,05