问题 解答题

脱式计算

(351-295)×2

850-350÷7

725-725÷25

654-(128+293)

答案

(1)(351-295)×2

=56×2

=112;

(2)850-350÷7

=850-50

=800;

(3)725-725÷25

=725-29

=696;

(4)654-(128+293)

=654-421

=233.

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