加法

[0] (+19) + (-15) =

+4

[1] (+8) + (-12) =

-4

[2] (+13) + (+11) =

+24

[3] (+9) + (+7) =

+16

[4] (+15) + (-9) =

+6

[5] (-17) + (-6) =

-23

[6] (-6) + (+12) =

+6

[7] (-9) + (-17) =

-26

[8] (-19) + (+8) =

-11

[9] (-9) + (+16) =

+7




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