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x + 75 - II tom
x + 75 - 25 - III tom
x+x+x+75+75-25=650
3x+125=650
3x=525//:3
x=175
pierwszy tom ma 175 str. drudi 250 str. trzeci 225 str.
I - x
II - x+75
III - x+75-25
x+x+75+x+75-25=650
3x+125=650
3x=650-125
3x=525
x=525:3
x=175 - tyle stron ma I tom
II tom-> 175+75=250
III tom -> 250-25=225
Jak coś to pisz na prv. :)