Sagot :
\int\limits^0.5_1 {lnx} \, dx = [xln(x)-x]
= 1ln(1) - 1 - 0.5ln(0.5) + 0.5
= 0.5(ln(2) + 1)
\int\limits^0.5_1 {-x²-x+4} \, dx = [-x^3/3 - x²/2 + 4x]
= (-1/3 -1/2 +4) - (-1/24 -1/8 +4/2)
= 2 - 5/6 + 1/24 + 1/8
= 2 - 16/24
= 2 - 2/3
= 4/3