Решите уравнения,плиииз

Question

Решите уравнения,плиииз

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Answer 1

1)(1600 + t) : 80 = 60
1600 + t = 60 * 80
1600 + t = 4800
t = 4800 - 1600
t = 3200
2)2000 : f - 670 = 1330
2000 : f = 1330 + 670
2000 : f = 2000
f = 2000 : 2000
f = 1
3)1300 - (d - 678) = 400
d - 678 = 1300 - 400
d - 678 = 900
d = 900 + 678
d = 1578

Answer 2

1600+t=60×80=4800
t= 4800-1600=3200
t=3200

2000÷f=1330+670=2000
f=2000÷2000=1
f=1

1300-d+678=400
-d=400-1300-678=-1578
d=1578