а) х:(910-890)=60 б) (560-у):8=30 решите плиз

х : (910 - 890) = 60

х = 60 * (910 - 890)

х = 60 * 20

х = 1200

Проверка: 1200 : (910 - 890) = 60

                   1200 : 20 = 60

                   60 = 60

(560 - у) : 8 = 30

560 - у = 30 * 8

560 - у = 240

у = 560 - 240

у = 320

Проверка: (560 - 320) : 8 = 30

                   240 : 8 = 30

                   30 = 30