计算:
2÷[(-)÷+×]
[3.25-3.25÷(10.3+2.2)]×0.1+5.6×2.5÷5.6×2.5.
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解:2÷[(-)÷+×],
=2÷[÷+×],
=2÷[(],
=2,
=1;
[3.25-3.25÷(10.3+2.2)]×0.1+5.6×2.5÷5.6×2.5,
=[3.25-3.25÷12.5]×0.1+5.6×2.5÷5.6×2.5,
=[3.25-0.26]×0.1+5.6×2.5÷5.6×2.5,
=2.99×0.1+5.6×2.5÷5.6×2.5,
=0.299+6.25,
=6.549.
解析分析:依据四则混合运算顺序:先算第二级运算,再算第一级运算,如果只含有同一级运算,按照从左到右顺序计算,有括号先算括号里面的顺序解答即可.
点评:本题主要考查学生依据四则运算顺序正确进行计算的能力,关键是计算结果要准确.