正方体的棱长为a,当棱长增加x时,体积增加了( )
A. a3-x3
B. x3
C. (a+x)3-a3
D. (a+x)3-x3
人气:365 ℃ 时间:2019-08-20 14:33:15
解答
根据题意,正方体的体积增加了(a+x)3-a3.故选C.
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