问题 解答题
计算下面各题,能简算的要简算,并写出主要的简算过程.
(1)9.06-2.68-0.32
(2)(3.06÷0.25+2.76)×0.2
(3)18-(
3
5
+4÷
2
5
)

(4)2.7×1.25+5.3×125%
答案

(1)9.06-2.68-0.32,

=9.06-(2.68+0.32),

=9.06-3,

=6.06;

(2)(3.06÷0.25+2.76)×0.2,

=(12.24+2.76)×0.2,

=15×0.2,

=3;

(3)18-(

3
5
+4÷
2
5
),

=18-(0.6+4×

5
2
),

=18-(0.6+10),

=18-10.6,

=7.4;

(4)2.7×1.25+5.3×125%,

=2.7×1.25+5.3×1.25,

=(2.7+5.3)×1.25,

=8×1.25,

=10.

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