题目内容

【题目】用简便方法计算4.4×0.25,下面错误的算法是(  )

A.4×0.25+0.4×0.25 B.(4.4×4)÷(0.25×4) C.(4.4÷4)×(0.25×4) D.4×0.25×1.1

【答案】B

【解析】

试题分析:①4.4×0.25,可以将4.4拆分为4+0.4,再运用乘法分配律进行简算;

②4.4×0.25,可以将4.4拆分为4×1.1,然后运用乘法结合律进行简算;

③4.4×0.25,可以根据积不变的性质,把4.4缩小4倍,把0.25扩大4倍,积不变.据出简算.

解:4.4×0.25,

=4×0.25+0.4×0.25,

=1+0.1,

=1.1;

②4.4×0.25,

=(4×0.25)×1.1,

=1×1.1,

=1.1;

③4.4×0.25,

=(4.4÷4)×(0.25×4),

=1.1×1,

=1.1;

所以错误的算法是:(4.4×4)÷(0.25×4).

故选:B.

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