1. ${2a*(5a-7)-5a(3-2a)=10a^{2}-14a-15a+10a^{2}=
\\=20a^{2}-29a}$
2. ${(2b-3)(4b+9)=8b^{2}-12b+18b-27=
\\=8b^{2}+6b-27}$
3. ${(2c-6)(8c+5)-(5c+2)(5c-2)=
\\=16c^{2}-48c+10c-30-(25c^{2}-4)=
\\=-9c^{2}-38c-26}$
6. ${(x-4)(x+4)-\left(x-8\right)^{2}=
\\=x^{2}-16-x^{2}+16x-64=16x-80}$
\\=20a^{2}-29a}$
2. ${(2b-3)(4b+9)=8b^{2}-12b+18b-27=
\\=8b^{2}+6b-27}$
3. ${(2c-6)(8c+5)-(5c+2)(5c-2)=
\\=16c^{2}-48c+10c-30-(25c^{2}-4)=
\\=-9c^{2}-38c-26}$
6. ${(x-4)(x+4)-\left(x-8\right)^{2}=
\\=x^{2}-16-x^{2}+16x-64=16x-80}$
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Благодарю. !отметить нарушение!TupicalGirl