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计算:-40-28-(-19)+(-24)-(-32);
计算:-3-4+19-11;
计算:
(1);
(2);
(3)-7.8×(-8.1)×0×|-19.6|;
(4).
计算:=________;(1-2)(2-3)(3-4)…(19-20)=________.
(7)22.54+(-4.4)+(-12.54)+4.4;