Помогите пожалуйста, срочно!!!!

10) 14x²y^5+7y^7 x³=

11) 12a²b²+18a^5-16ab^6=

12) (x-6)(2x+3)+(6-x)(x+6)=

13)2m²(m+5)²-4m³(5+m) =
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