litanalove 868. a) =(1-0.8)(1+0.8)/0.6 = 0.2*1.8 /0.6 =0.2*3 =0.6

в) 6.4/(4 -0.8)(4+0.8) =6.4 / 3.2*4.8 =2/4.8 =2 : 48/10 =2 * 10/48 =20/48 =5/12

д) (1.7-1.3)(1.7+1.3) / (2.8 -2.2)(2.8+2.2) =0.4*3 / 0.6*5 =0.4*5/5 =0.4