(x+y^2)+(2x+y^2/1*2)+(3x+y^2/2*3)+.+(9x+y^2/8*9)
=x+2x+3x+.+9x+y^2+y^2/1*2+y^2/2.*+.+y^2/8*9
=(1+9)*9x/2+y^2(1+1/1*2+1/2*3+...+1/8*9)
=45x+y^2(1+1-1/2+1/2-1/3+...+1/8-1/9)
=45x+y^2(1+1-1/9)
=45x+17y^2/9
=45*1/9+17*(-3)^2/9
=5+17
=22
(x+y^2)+(2x+y^2/1*2)+(3x+y^2/2*3)+.+(9x+y^2/8*9)
=x+2x+3x+.+9x+y^2+y^2/1*2+y^2/2.*+.+y^2/8*9
=(1+9)*9x/2+y^2(1+1/1*2+1/2*3+...+1/8*9)
=45x+y^2(1+1-1/2+1/2-1/3+...+1/8-1/9)
=45x+y^2(1+1-1/9)
=45x+17y^2/9
=45*1/9+17*(-3)^2/9
=5+17
=22