(x平方减y平方)(x-y)平方 减(x-y)四次方=?

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(x平方减y平方)(x-y)平方减(x-y)四次方=?(x平方减y平方)(x-y)平方减(x-y)四次方=?(x平方减y平方)(x-y)平方减(x-y)四次方=?(x平方减y平方)(x-y)平方减(x

(x平方减y平方)(x-y)平方 减(x-y)四次方=?
(x平方减y平方)(x-y)平方 减(x-y)四次方=?

(x平方减y平方)(x-y)平方 减(x-y)四次方=?
(x平方减y平方)(x-y)平方 减(x-y)四次方
=(x+y)(x-y)³ - (x-y)的4次幂
=(x-y)³[(x+y)-(x-y)]
=2y(x-y)³