Задание 1.
1)(3-а)(6-b)=18-3b-6a+ab
2)3a(5-b)=15a-3ab
3)8a(3a-4)(a-b)=8a(3a²-3ab-4a+4b)=24a³-24a²b-32a²+32ab
4)3x(y+5)(x-y)=3x(xy-y²+5x-5y)=3x²y-3xy²+15x²-15xy
5)8y(x-3)=8xy-24y
Задание 2.
1)(3x-2)²=9x²-12x+4
2)(3y+4)²=9y²+24y+16
3)(8a-3)²=64a²-48a+9
4)(5-4x)³=125-300x+240x²-64x³
5)(9+5y)³=729+1215y+675y²+125y
6)(4-8y)³=64-384y+768y²-512y³