问题 解答题

计算,能简算的要写出过程

375+450÷18×25

45×101

4.05-2.8-0.7.

答案

(1)375+450÷18×25,

=375+25×25,

=375+625,

=1000;

(2)45×101,

=45×(100+1),

=45×100+45×1,

=4500+45,

=4545;

(3)4.05-2.8-0.7,

=4.05-(2.8+0.7),

=4.05-3.5,

=0.55.

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