问题 解答题

①100+(10+20+30)

②100-(10+20+3O)

③100-(30-10)

答案

①100+(10+20+30)

=100+60,

=160;

②100-(10+20+3O)

=100-60,

=40;

③100-(30-10)

=100-20,

=80.

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