初中有理数加减混合运算1.计算: (1)-2.5+(-1/5) (2) 0.4-(-1/4)+1/6 (3)1/3-(-5/6)+2/3 (4) 1/3+(-1/5)+1+2/3 (5)27-18+(-7)-32 (6)0.5+(-1/4)-(-2.75)+1/2 2.计算: (1)33.1-(-22.9)+(

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