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-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:该题考查数学计算.a+2ab+1=3+2×3×4+1=28


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