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(a－b)的三次方咋求？ - 知乎 这就是 ( (a - b)^3 ) 的几何意义：它是一个边长为 ( a - b ) 的立方体的体积。 简单地说，它告诉我们在三维空间中，用这个差值作为边长构成的立方体会有多大。
乘法公式 - 維基百科，自由的百科全書 a 3 − b 3 = ( a − b ) 3 + 3 a b ( a − b ) = ( a − b ) ( a 2 + a b + b 2 ) {\displaystyle a^ {3}-b^ {3}= (a-b)^ {3}+3ab (a-b)= (a-b) (a^ {2}+ab+b^ {2})\,\!}