Реши уравнения:
1600/80+t=60
(2000 - 600 ) / f = 70
d - (1300 - -678 ) = 400
1600/80+t=60
(2000 - 600 ) / f = 70
d - (1300 - -678 ) = 400
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t=60-(1600/80)
t=40
(2000-600)/f=70
f=(2000-600)/70
f=20
d-(1300-678)=400
d=(1300-678)+400
d=1022