题目内容

【题目】直接写出得数.

0.44+++0.6 +2×2﹣2÷ (4﹣2)÷(1+2.4)

48200﹣156×720÷39 (3.06÷0.25+2.76)×0.2 [3÷(3﹣2.4×]×0.2.

【答案】2 2 45320 3

【解析】

试题分析:(1)先把分数化成小数,然后再运用加法结合律简算;

(2)同时运算乘法和除法,再算加法,最后算减法;

(3)同时运算两个小括号里面的减法和加法,最后算括号外的除法;

(4)先算乘法,再算除法,最后算减法;

(5)先算小括号里面的除法,再算小括号里面的加法,最后算括号外的乘法;

(6)先算小括号里面的乘法,再算小括号里面的减法,然后算中括号里面的除法,最后算括号外的乘法.

解答:解:(1)0.44+++0.6,

=0.44+0.4+0.56+0.6,

=(0.44+0.56)+(0.4+0.6),

=1+1,

=2;

(2)+2×2﹣2÷

=+﹣3,

=5﹣3,

=2;

(3)(4﹣2)÷(1+2.4),

=2÷3

=×

=

(4)48200﹣156×720÷39,

=48200﹣112320÷39,

=48200﹣2880,

=45320;

(5)(3.06÷0.25+2.76)×0.2,

=(12.24+2.76)×0.2,

=15×0.2,

=3;

(6)[3÷(3﹣2.4×]×0.2,

=[3÷(3﹣]×0.2,

=[3÷]×0.2,

=×

=

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