问题 解答题

0.25×9.9=0.25×(10-1)=0.25×10-0.25.______.

答案

0.25×9.9,

=0.25×(10-0.1),

=0.25×10-0.25×0.1,

=2.5-0.025,

=2.475.

故答案为:错误.

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单项选择题