问题 解答题

用简便的方法计算;

①283-47-153  ②842-368-132  ③273-98

④267+153+433 ⑤782-216-184  ⑥472-127-123.

答案

①283-47-153

=283-(47+153)

=283-200

=83;

②842-368-132 

=842-(368+132)

=842-500

=342;

③273-98

=273-(100-2)

=273-100+2

=175;

④267+153+433 

=267+433+153

=700+153

=853;

⑤782-216-184 

=782-(216+184)

=782-400

=382;

⑥472-127-123

=472-(127+123)

=472-250

=222;

故答案为83;342;175;853;382;222.

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