31.21×16+3.121×120+312.1×6.2的值是(  )。A.31

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问题 31.21×16+3.121×120+312.1×6.2的值是(  )。A.3121B.2808.9C.4125 D.3768

选项 A.3121
B.2808.9
C.4125
D.3768

答案 B

解析 对原式进行转化,构造相同的公因数31.21。
原式=31.21×16+31.21×12+31.21×62
=31.21×(16+12+62)
=31.21×90
=2808.9
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