Proszę o szybką pomoc ze wszystkimi zadaniami

1. z=5-2i w=3+4i a) z w* = (5-2i)(3-4i)=15-6i-20i-8=7-26i b)(5+4i)/(8-2i)=(5+4i)(8+2i)/(64+4)=(32+42i)/68 = (16+21i)/34 c)(25+4)+(9+16)=54 2. (1+i)^6=[sqrt(2)*(cos(pi/4)+isin(pi/4))]^6=8*(cos(6pi/4)+isin(6pi/4))=8(cos(3pi/2)+isin(3pi/2))=8*(-i)=-8i 3. w=16^{1/4}= 2 v w= -2 v w= 2i v w= -2i 4. f'_{y}=49x^5 y^6 f'_{x}=35x^4 y^7 + 4 f^{''}_{yy}=294x^5 y^5 f^{''}_{xx}=140x^3 y^7 f^{''}_{xy}=f^{''}_{yx}=245x^4 y^6 5. f'x=2x-2=0 f'y=2y+6=0 f''xx=2 f''yy=2 f''xy=f''yx=0 (xmin,ymin)=(1,-3) f(x,y)=-5

Dziękuje ;)