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f (x) , , . x = a x = b, , .
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: ∫12 3xdx
1 2 3x dx
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, , x3x dx = x3 + C
x = 1 x3x dx = 13 + C
x = 2 x3x dx = 23 + C
2 1: (23 + C) - (13 + C)
= 8 -1 + C - C = 7 ( , 7, )
, , . !