Допоможіть будь ласа

1) (a+7)(a-7)= a²-49.

2) (6+x)(x-6)= (x+6)(x-6)= x²-36.

3) (4b-1)(4b+1)= 16b²-1.

4) (8m+3y)(3y-8m)= (3y+8m)(3y-8m)= 9y²-64m².

5) (x⁷-q⁵)(x⁷+q⁵)= x¹⁴-q¹⁰.

6) (7a²y³-⅕ay²)(7a²y³+⅕ay²)= 49a⁴y⁶- 1/25 a²y⁴= 49a⁴y⁶-0,04a²y⁴.

7) (0,3p²+0,2q⁴)(0,3p²-0,2q⁴)= 0,09p⁴-0,04q⁸.

8) (x⁴-y⁴)(x⁴+y⁴)(x⁸+y⁸)= (x⁸-y⁸)(x⁸+y⁸)= x¹⁶-y¹⁶.

9) (m⁶-n⁵)(-m⁶-n⁵)= (-n⁵+m⁶)(-n⁵-m⁶)= (-n⁵)²-(m⁶)²= n¹⁰- m¹².

10) (1,3a¹¹+2/9 b³)(2/9 b³- 1,3a¹¹)= (2/9b³+1,3a¹¹)(2/9 b³-1,3a¹¹)= 4/81 b⁶- 1,69a²².