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计算:7.816×1.45+3.14×2.184+1.69×7.816=.

题目详情
计算:7.816×1.45+3.14×2.184+1.69×7.816=______.
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答案和解析
7.816×1.45+3.14×2.184+1.69×7.816
=7.816×1.45+1.69×7.816+3.14×2.184
=7.816×(1.45+1.69)+3.14×2.184
=7.816×3.14+3.14×2.184
=3.14×(7.816+2.184)
=3.14×10
=31.4;
故答案为31.4.