问题 填空题

25+26-12-13+27+28-14-15+29+30-16-17=______.

答案

25+26-12-13+27+28-14-15+29+30-16-17,

=(25-12)+(26-13)+(27-14)+(28-15)+(29-16)+(30-17),

=13×6,

=78;

故答案为:78.

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