问题
解答题
递等式计算(能巧算的要巧算)
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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.