k=>yx,=1,2.8,k=O,1,2 4=∑yx=8309=∑yx2=40742=∑x2=245838 i=1 83.09 U=410.74 2458.38, 1,2...8, 0,1,2 1 = = = = u y x i k n i k k i i 83.09 8 1 0 0 =  = i= i i u y x 410.74 8 1 1 1 =  = i= i i u y x 2458.38 8 1 2 2 =  = i= i i u y x           = 2458.38 410.74 83.09 U