Выполнить умножение: 1)(a-z)(a+z) 2)(a+p)(a-p) 3)(f+5)(5-f) 4)(10+b)(10-b) 5)(7x-8y)(7x+8y) 6)(1-k)(k+1) 7)(3d^2-4p)(3d^2+4p)

1)(a-z)(a+z)=а²-z²
2)(a-p)(a+p)=a²-p²
3)(5-f)(5+f)=25-f²
4)(10-b)(10+b)=100-b²
5)(7x-8y)(7x+8y)=49x²-64y²
6)(1-k)(1+k)=1-k²
7)(3d-4p)(3d+4p)=9d⁴-16p²

1) (a-z)(a+z)=a²+az-za-z²=a²-z²
2) (a+p)(a-p)=a²-ap+pa-p²=a²-p²
3) (f+5)(5-f)=5f-f²+25-5f=-f²+25=25-f²
4) (10+b)(10-b)=100-10b+10b-b²=100-b²
5) (7x-8y)(7x+8y)=49x²+56xy-56yx-64y²=49x²-64y²
6) (1-k)(k+1)=k+1-k²-k=1-k²
7) (3d²-4p)(3d²+4p)=9d⁴+12pd²-12pd²-16p²=9d⁴-16p²