<span>-(2a+8c)+(7a-11c)=
=-2a-8c+7a-11c=
=(-2+7)a+)-8-11)c=
=5a-19c.</span>
5/6+2/3=5/6+4/6=9/6=6/9
6,2-5,8=0,4=4/10=10/4
1/15*1/16=1/240=240/1
4,9:3,5=1,4=14/10=10/14
2,86+(-4,3)=-1,44=1,44
-4/9-5/6=-8/18-15/18=-23/18=23/18
-5,75*1,6=-9,2=9,2
46:(-7 2/3)=46*(-3/23)=-6=6
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7:21/3+4:1/3= 7/1*3/21+4/1*3/1=1+12=13
A)|z|=√4+9=√13
argz=arctg(3/-2)=-arctg3/2
z=-2+3i=√13e^(-arctg3/2i)=√13(cos(-arctg3/2)+isin(-arctg3/2))
б)|z|=√36=6
argz=arctg6/0=arctg∞=π/2
z=6i=6e^(90°i)=6i