问题 填空题

计算:7.81×49-78.1×3.8+0.781×90=______.

答案

7.81×49-78.1×3.8+0.781×90,

=78.1×4.9-78.1×3.8+78.1×0.9,

=78.1×(4.9-3.8+0.9),

=78.1×2,

=156.2

故答案为:156.2.

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