Q=cmt
Q=4200*1*(20-t)
8400=4200*(20-t)
20-t=8400/4200
20-t=2
t=18 градусов
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Q=cmt
Q=4200*1*(20-t)
8400=4200*(20-t)
20-t=8400/4200
20-t=2
t=18 градусов