问题 解答题
计算下面各题,能用简便算法的用简便算法
(1)2.3+3.91÷(22-19.7)(2)13.7×0.125×8(3)18-(1.4+1.25×2.4)(4)2.65×1.7+1.35×1.7.
答案

(1)2.3+3.91÷(22-19.7),

=2.3+3.91÷2.3,

=2.3+1.7,

=4;

(2)13.7×0.125×8,

=13.7×(0.125×8),

=13.7×1,

=13.7;

(3)18-(1.4+1.25×2.4),

=18-(1.4+3),

=18-4.4,

=13.6;

(4)2.65×1.7+1.35×1.7,

=(2.65+1.35)×1.7,

=4×1.7,

=6.8.

单项选择题
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