6)==2,5
7)С
8)(+)²-=33++12-=33++12-=33+12=45
9) х²+6х+9=х²+16х+64
6х+9=16х+64
-10х=55
х=-5,5
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6)
=
=2,5
7)С
8)(
+
)²-
=33+
+12-
=33+
+12-
=33+12=45
9) х²+6х+9=х²+16х+64
6х+9=16х+64
-10х=55
х=-5,5