问题 解答题
递等式计算(能巧算的要巧算)
①875+659+125②848-532+468③475+5409÷9
④813-256-344⑤77+649-649⑥99×7+7.
答案

①875+659+125

=875+125+659,

=1000+659,

=1659;

②848-532+468

=336+468,

=804;

③475+5409÷9

=475+601,

=1076;

④813-256-344

=813-(256+344),

=813-600,

=213;

⑤77+649-649

=649-649+77,

=0+77,

=77;

⑥99×7+7

=(99+1)×7,

=100×7,

=700.

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