1)∫x³dx=xˇ4/4
(1ˇ4/4 - (-2/3)ˇ4/4)=(1/4-(16/81)/4)=1/4 - 4/81=(81-16)/81=65/81
2)∫dx/x²=∫xˇ(-2)dx=xˇ(-1)/(-1)=-1/x
(-1/3 - (-1/1))=-1/3+1=2/3
3)∫xˇ4 dx= xˇ5/5
2ˇ5/5 - (-1)ˇ5/5=32/5+1/5=33/5=6,6
4)∫dx/√x=∫xˇ(-1/2)dx=(xˇ(1/2)/(1/2)=2√x
2√9-2√4)=2.3-2.2=6-4=2