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计算:-3-4+19-11;
计算:-9×(-11)-12×(-8);
计算:
(1)(-17)×(-49)×0×(-13)×37;
(2)-9×(-11)-12×(-8).
(1)[(-11)-(-23)]-6;
(2)0-(-3.71)-(+1.71)-(-5).
(1)|+3|+|-2|;
(2)|+11|-|-5|;
(3)|+12|-|-2|.