问题 解答题
用简便方法计算
(1)0.75×14+0.25×14
(2)25×9.26×4
(3)99×2.45(4)9.85×2.3+8.85×2.3.
答案

(1)0.75×14+0.25×14,

=(0.75+0.25)×14,

=1×14,

=14;

(2)25×9.26×4,

=9.26×(25×4),

=9.26×100,

=926;

(3)99×2.45,

=(100-1)×2.45,

=100×2.45-2.45,

=245-2.45,

=242.55;

(4)9.85×2.3+8.85×2.3,

=(9.85+8.85)×2.3,

=18.7×2.3,

=43.01.

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