问题 解答题
怎样简便就怎样算
16.4+3.5+83.6+166.5
4
5
×38.3+2.7×0.8
498+9870÷35420.5-294÷2.8×2.1.
答案

(1)16.4+3.5+83.6+166.5,

=(16.4+83.6)+(3.5+166.5),

=100+170,

=270;

(2)

4
5
×38.3+2.7×0.8,

=0.8×38.3+2.7×0.8,

=0.8×(38.3+2.7),

=0.8×41,

=32.8;

(3)498+9870÷35,

=498+282,

=780;

(4)420.5-294÷2.8×2.1,

=420.5-105×2.1,

=420.5-220.5,

=200.

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