2x-y при x=1,5;y=2

(x-y)*(x+y)при 0,5*y=0,15

2x-y = 2*1,5 - 2 = 3 - 2 = 1-------------------(x-y)*(x+y)=(0,5-0,15)*(0,5+0,15)=0,35*0,65=0,2275