Mathematics
Senior High

1回目では、xを積分の形にして、2回目では(logx)²を積分の形にしているのはなぜですか?

(3) f(log xdx=f(x)(log x)³dx = x( log x)² - x({ log x)²) dx 1 =xlogr)®−| r.2logx•=dr = x(log x )?—2| log xdx = x(log x)²2 - 2f (x) log xdx = x( log x)² — 2(xlog x − 5 x· ¹-dx) -
(3) S(logx) dx

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