一道SAT数学题A spherical balloon with radius r inches has volume

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一道SAT数学题
A spherical balloon with radius r inches has volume V（r）=4/3πr^3.Find a function that represents the amount of air required to inflate the balloon from a radius of r inches to a radius of r+1 inches.

已知气球的体积V与其半径的关系式为 V（r）=4/3πr^3,求当气球半径从r增加到r+1时,所需充入的气体体积.
4/3π(r+1)^3 - 4/3πr^3,剩下的自己化简.
再问：为什么要两式相减啊能讲一下过程吗

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