Решить уравнения; (1600 + t) : 80 = 60; 2000:f-670=1330; 1300 - (d - 678) = 400

(1600 + t) : 80 = 60

1600 + t = 60 * 80

1600 + t = 4800

t = 4800 - 1600

t = 3200

2000 : f - 670 = 1330

2000 : f = 1330 + 670

2000 : f = 2000

f = 2000 : 2000

f = 1

1300 - (d - 678) = 400

d - 678 = 1300 - 400

d - 678 = 900

d = 900 + 678

d = 1578