1) 2/7 х = 1 2) 9 х = 1 3) 1 1/8 х = 1 4) 1/2 х= 1 5) 7/15 х = 1 6) 3 2/5 х = 1 7) 100 х = 1 8) 2/13 х = 1

1)3.5 2)1.4 3)12.4 4)30 5)

Пошаговое объяснение:

1)2/7*x = 1

x = 1 / (2/7)

x = 7/2

x1 = 3.5

2)9*x = 13

x = 13 / (9)

x = 13/9

x = 1.44444444444

3)1 1/8 х = 1 4

x = 14 / (9/8)

x = 112/9

x1 = 12.4444444444

4)x = 15 / (1/2)

x = 30

5)x = 16 / (7/15)

x=240/7

x=34.2857142857