1 труба : t = 34мин. V = x+4. S = 39(x+4).
2 труба : t = 41мин. V = x. S = 41x.
39(x+4)=41x
39x+156=41х
39х-41х=-156
-2х=-156
х=-156:(-2)
х=78
Ответ 78
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1 труба : t = 34мин. V = x+4. S = 39(x+4).
2 труба : t = 41мин. V = x. S = 41x.
39(x+4)=41x
39x+156=41х
39х-41х=-156
-2х=-156
х=-156:(-2)
х=78
Ответ 78