－If a=3, b=4, what's the answer to the problem, a+2ab+1=?

－The answer is ________.

[　　]

A．twenty-eight
B．twenty-eighth
C．thirteen
D．eighteenth
答案：A
解析：

思路分析：該題考查數(shù)學計算．a+2ab+1=3+2×3×4+1=28．


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