|z|=√((-2)²+(-2)²)=√(4+4)=√8=2√2
argz=-π+arctg(-2/-2)=-π-arctg1=-π+π/4=-3π/4
z=2√2*(cos(-3π/4)+isin(-3π/4))
z^8=(2√2)^8*(cos(-3π/4 *8)+isin(-3π/4*8))=4096*(cos(-6π)+isin(-6π))=
=4096*(cos0+Isin0)=4096*(1+i*0)=4096
Номер 312:
б)1/15
в)12*10/24*7=1*5/1*7=5/7
г)14*3/5*28=1*3/5*2=3/10
д)14*10/15*21=2*2/3*3=4/9
е)16*51/17*64=816/1088=51/68
313-318=-5
номер 313:
а)1/4
б)9/26
в)5*9/6*11=5*3/2*11=15/22
г)5*7/4*10=1*7/4*2=7/8
д)6*14/7*11=6*2/1*11=12/11
е)51*5/61*17=3*5/51*1=5/17
Х+х≥4-1-5
2х≥ -2 |:2
х≥ -1