大家帮忙分析下这道题

sophia550107

Let A and B be two solid spheres such that the surface area of B is 300% higher than the
surface area of A. The volume of A is found to be k% lower than the volume of B. The value
of k must be?

去台北看月亮

表面积S=4πr^2
体积V=4/3πr^3
然后解出k=12.5

sophia550107

答案选项是下面四个中的一个  再看看
85.5
92.5
90.5
87.5

iyogur

sophia550107 发表于 2014-12-13 20:38
答案选项是下面四个中的一个  再看看
85.5
92.5

87.5吧。100-12.5=87.5