1)a^2-2a+1=(a-1)^2
2)4x^2+4xy+y^2=(2x+y)^2
3)4b^2+28ab+49a^2=(2b+7a)^2
4)0,25n^2+10mn+100m^2=(0,5n+10m)^2
5)b^2+8ab+16a^2=(b+4a)^2
1) (3х²-2х)+( -х²+3х)=3х²-2х-х²+3х=2х²+х=х(2х+1)
2)(4с²-2cd)(-10c²+8cd)=4c²-2cd+10c²-8cd=14c²-10cd=2c(7c-5d
3)(12m²-7n-3mn)-(6mn-10n+14m²)= 12m²-7n-3mn-6mn+10n-14m²= 3n-2m²-9mn
4) (3n³-3mn+4m³)-(2mn+3n³)=3n³-3mn+4m³-2mn-3n³=4m³-5mn