1=14b+b²-49+b²-14b+49=2b²2*(-1/3)²=2/921)=5х(1-2у)2)=3m³(1-4m)3)=(a/5 -b)(a/5 +b)4)=(n+10)²3=(a²+1)(a-2-a)=-2(a²+1)41)=-(a/√8 - b/√8)2)=3a(b-4) - 2(b-4) = (b-4)(3a-2)3)=x²(х+3) - (х+3) = (х²-1)(х+3)5(2-х)((2-х)²+(2-х)х+4)=0(2-х)(4-4х+х²+2х-х²+4)=0(2-х)(-2х+8)=02-х=0 -2х+8=0х=2 х=4