问题 解答题
用简便方法计算.
73+3.4+27+5.6
7.25-3.42-1.58
99×32125×89×8.
答案

(1)73+3.4+27+5.6,

=(73+27)+(3.4+5.6),

=100+9,

=109;

(2)7.25-3.42-1.58,

=7.25-(3.42+1.58),

=7.25-5,

=2.25;

(3)99×32,

=100×32-1×32,

=3200-32,

=3168;

(4)125×89×8,

=125×8×89,

=1000×89,

=89000.

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