1. №3
2. а^2*б
3. =х(у^2+б)/3х(у+б^2) = у^2+б /3(у+б^2)
5. =(б+2)(б+2)-(б-2)(б-2) / (б-2)(б+2) = б^2+4б+4-б^2+4б-4 / б^2-4 = 8б/б^2-4
6. =(х+1)^2/ x(x^2+2X+1)*x = (х+1)^2/ x^2(х+1)^2= 1/x^2
4. (1+х)(2-х) / (2-х)(2+х) (1-х)(2+х) / (2+х)(2-х)
2-х+2х-х^2 /4-х^2 2+x-2x-x^2 / 4-х^2
2+x-х^2 / 4-х^2 2-x-x^2 / 4-х^2