Даю 60 баллов!
1) 15 а^2-10ab
(Дробная черта) = при а= - 2, b= - 0.1
3ab-2b^2

2) 9с^2 - 4b^2
(Дробная черта)= при b=0.5, c=2/3
18c^2 - 12bc
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