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321+(279-155)脱式计算格式是怎么样的?

(1)669×27+18×321

=18063+5778

=23841;

(2)900+100×260-60

=900+26000-60

=26900-60

=26840;

(3)279+(345-145×2)

=279+(345-290)

=279+55

=334;

(4)1000-(75×3+763)

=1000-(225+763)

=1000-988

=12.

匿名回答于2024-05-23 07:42:58


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