Question

ex 3 nu înțeleg va rog ajutor dau coroana​

Answer 1

$a)x+3xi+2y+5yi=7+i\\x+2y+3xi+5yi=7+i\\x+2y+(3x+5y)i=7+1\\\left \{ {{x+2y=7} \atop {3x+5y=1}} \right. \\\\inmultim// prima// ecuatie //cu -3 \\\left \{ {{-3x-6y=-21} \atop {3x+5y=1}} \right. \\adunam //ecuatiile\\-y=-20\\y=20\\3x+5*20=1\\x=-33$

La b și d nu inteleg ce semnifica acele bare

$c)xi+i(xi+x-(3y+yi))=3+2i\\xi+i(xi+x-3y-yi)=3+2i\\xi+i^2x+xi-3yi-i^2=3+2i\\xi-x+xi-3yi+1y=3+2i\\2xi-x-3yi+y=3+2i\\-x+y+2xi-3yi=3+2i\\-x+y+(2x-3y)i=3+2i\\\left \{ {{-x+y=3} \atop {2x-3y=2}} \right. \\\left \{ {{-2x+2y=6} \atop {2x-3y=2}} \right. \\-y=8\\y=-8\\-x-8=3\\x=-11$