1、计算(要写计算过程,写清楚)(1)(-1)+(-2)+(-3)+(-4)+(-8)+8 (2)3+(-1)+(-3)+1+(-4)(3) (-23)-(-18)-1+(-15)+23 (4) (-56)-48-(-48)-(-56)2、计算(要写计算过程,写清楚)(1)(负5分之6)-(-0.2

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