Help... me.... pleace #5

Question

Help... me.... pleace
#5

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Comments

уравнение? ?

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Yes, yes, yes

Answer 1

1. (1600+t):80=60
1600+t=60*80
t=4800-1600
t=3200

Comments

2000:f-670=1330   2000:f=1330+670=2000  f=2000:2000   f=1

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1300-(d-678)=400    -d+678=-900  d=900-678   d=222

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1600:80+t=60   20+t=60   t=60-20=40

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(2000-600):f=70   1400:f=70  f= 1400:70  f=20

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d-(1300-678)=400   d-622=400   d=400+622=1022

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ВСЁ!

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Thank you very much!