问题 解答题
计算,能简算的要简算
10÷0.2÷2.58.4÷0.21÷0.51.25×3.2×0.25
14.5×10214.64+3.7×2.83.5×0.7+7.5×0.7-0.7.
答案

①10÷0.2÷2.5,

=10÷(0.2×2.5),

=10÷0.5,

=20;

②8.4÷0.21÷0.5,

=40÷0.5,

=80;

③1.25×3.2×0.25,

=(1.25×8)×(0.4×0.25),

=10×0.1,

=1;

④14.5×102,

=14.5×(100+2),

=14.5×100+14.5×2,

=1450+29,

=1479;

⑤14.64+3.7×2.8,

=14.64+10.36,

=25;

⑥3.5×0.7+7.5×0.7-0.7,

=0.7×(3.5+7.5-1),

=0.7×10,

=7.

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