a) 3/5 * x = 1

x = 5/3

б) 3/7 * x = 1/2

x = (1/2) * (7/3)

x = 7/6

B) 5/6 * x = 2/3

x = (2/3) * (6/5)

x = 4/5

1)3/5*×=1

5/3×3/5×=5/3×1

решение

х=5/3

2)3/7*×=1/2

7/3×3/7×=7/3×1/2

решение

х=7/6

3)х=5/6*×=2/3

6/5×5/6×=6/5×2/6

х=2/5×2

решение

х=4/5