Просто решить.
1.(5a - 12b)(5a + 12b)=
2.(6a + 5b)²=
3.(8a - b)²=
4.(а + 3)(а² - 3а +9)=
5. (b - 2)(b²+ 2b +4)=
6.(- a² + 9)(a² + 9)=
7.(a⁸ + b ⁸)(a⁴ + b ⁴)(a⁴- b ⁴)=

1.(5а)^2-(12b)^2=25a^2-144b^22.(6a)^2+2*6a*5b+(5b)^2=36a^2+60ab+25b^23.(8a)^2-2*8a*b+b^2=64a^2-16ab+b^24.a^3-3^3=a^3-275.b^3-2^3=b^3-86.(a^2-9)(a^2+9)=(a^2)^2-9^2=a^4-81