Rostim 1)(m-5)^2=m^2-10m+25
2)(2a+7b)^2=4a^2+14ab+49b^2
3)(a+3)(a-3)=a^2+9
4)(8x+5y)(5y-8x)=65x^2+25^y

1)x^2-81=(x-9)(x+9)
2)y^2-6y+9=(y-3)(y+3)
3)16x^2-49=(4x-7)(4x+7)
4)9a^2+30ab+25b^2=(3a+5b)^2

leorenzo N1
1.m²-5m+25
2.4a²+14ab+49b²
3.a²-9
4.40xy+25y²-64x²
N2
1.(x-9)(ч+9)
2.(y-3)²
3.(4x-7)(4x+7)
4(a-5)²