a) (2,5х+3)(4х-1)-2,5х(4х+2)<3 10x^2-2,5х+12х-3-10x^2-5х<3 4.5x<9 x<2 б)(1-4х)^2-(8х-1)(2х+1)>0 1-8х+16х^2-16x^2-8x+2x+1>0 -14x>-2 x<1/7