75+69+70+68+73+72+69+70=(70+5)+(70-1)+70+(70-2)+(70+3)+(70+2)+(70-1)+70=70×8+(5-1-2+3+2-1)=560+6=566
=70+5+70-1+70+70-2+70+3+70+2+70-1+70=70×8+(5-1-2+3+2-1)=560+6=566
