У5-У1=4d, d=28:4=7
Y6+Y3-Y2=Y6+Y1=33
Y6=Y1+5d, Y1+5d+Y1=33
2Y1=33-5•7, Y1=-2/2= -1
S10= (2A1+9d)•10/2=(2•(-1)+9•7)•5=(-2+63)•5=61•5=315
У5-У1=4d, d=28:4=7
Y6+Y3-Y2=Y6+Y1=33
Y6=Y1+5d, Y1+5d+Y1=33
2Y1=33-5•7, Y1=-2/2= -1
S10= (2A1+9d)•10/2=(2•(-1)+9•7)•5=(-2+63)•5=61•5=315