问题 解答题

用简便方法计算

①0.4×1.36×2.5 ②0.45×101 ③3.8×4.6+4.6×6.2.

答案

①0.4×1.36×2.5,

=1.36×(0.4×2.5),

=1.36×1,

=1.36;

②0.45×101,

=0.45×100+0.45×1,

=45+0.45,

=45.45;

③3.8×4.6+4.6×6.2,

=(3.8+6.2)×4.6,

=10×4.6,

=46.

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