问题 解答题

计算:

(1)(-61)-(-71)-|-8|-(-2);

(2)3-[(-3)-(+12)];

(3)(3-5)-(6-10).

答案

(1)(-61)-(-71)-|-8|-(-2),

=-61+71-8+2,

=-69+73,

=4;

(2)3-[(-3)-(+12)],

=3-(-3-12),

=3-(-15),

=3+15,

=18;

(3)(3-5)-(6-10),

=-2-(-4),

=-2+4,

=2.

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