(-1/2)+(1/3)+(-1/4)+(1/9)+(1/8)+(-4/9) =

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(-1/2)+(1/3)+(-1/4)+(1/9)+(1/8)+(-4/9) =
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(-1/2)+(1/3)+(-1/4)+(1/9)+(1/8)+(-4/9) =
(-1/2)+(1/3)+(-1/4)+(1/9)+(1/8)+(-4/9) =

(-1/2)+(1/3)+(-1/4)+(1/9)+(1/8)+(-4/9) =
-1/2）+（+1/3）+（-1/4）+（+1/9）+（+1/8）+（-4/9）=（-1/2-1/4+1/8）+（1/3+1/9-4/9）=-5/8+0=-5/8