1. А) =x²-8x+16
Б)=9x²-30x+25
В)=4a²-9
Г)y⁴-4
2.(b-0.6)(b+0.6)
(y-3)²
3.=6ab-9b²+a²-6ab+9b²=a²=4/49
4. а) =5(4-9x²y²)=20-45x²y²
б)=а^6-2а³b²+b⁴
в) =x²+2xy+y²-x²+2xy-y²=4xy
