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When the length of each side of a certain cube is increased by 2 cm, the volume of the cube is increased by 98 cm3. What is the length of a side of the original cube?
A、2.0
B、3.0
C、5.0
D、6.0
E、8.0
答案：B
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这不是，底面积*高=98，高=2所以底面积49，每个边7.因为加了2厘米，所以原来就是5.这咋是3呀
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