13-1④,13-3a=6,13-7a=-1,b=0,13-9④,13-11(1)x=1/3,7(2)x=0,1,-1(3)x=(-1±i)/2,(1±i)/213-13x=4,2,-3,13-15a=3,알파=-7,베타=2,13-17p=-1,q=3,r=5홀수답이에용~
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