Помогите разложить на множители) Алгебра 8 класс.
[tex](d^{2}t + d^{2}m)- k^{4} t- k^{4} n \\ 6 a^{3}-21 a^{2}b+2a b^{2}-7 b^{3} \\ 81 a^{2}+6bc-9 b^{2}- c^{2} [/tex]
[tex](d^{2}t + d^{2}m)- k^{4} t- k^{4} n \\ 6 a^{3}-21 a^{2}b+2a b^{2}-7 b^{3} \\ 81 a^{2}+6bc-9 b^{2}- c^{2} [/tex]
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!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!d²(t+m)-k^4(t+m)=(t+m)(d²-k^4)=(t+m)(d-k²)(d+k²)
2
2a(3a²+b²)-7b(3a²+b²)=(2a-7b)(3a²+b²)
3
81a²-(-6bc+9b²+c²)=81a²-(c-3b)²=(9a-c+3b)(9a+c-3b)