问题 解答题

用简便方法计算.

(1)44.4×25

(2)0.64×125.

答案

(1)44.4×25,

=(40+4+0.4)×25,

=40×25+4×25+0.4)×25,

=1000+100+10,

=1110;

(2)0.64×125,

=0.8×0.8×125,

=0.8×(0.8×125),

=0.8×100,

=80.

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