(a+b)(a-b)(a2-b2)

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(a+b)(a-b)(a2-b2)(a+b)(a-b)(a2-b2)(a+b)(a-b)(a2-b2)=(a-b+c)/(a+b-c)-(a-2b+3c)/(a+b-c)-(b-2c)/(a+b-c)

(a+b)(a-b)(a2-b2)
(a+b)(a-b)(a2-b2)

(a+b)(a-b)(a2-b2)
=(a-b+c)/(a+b-c)-(a-2b+3c)/(a+b-c)-(b-2c)/(a+b-c)
=(a-b+c-a+2b-3c-b+2c)/(a+b-c)
=(0+0+0)/(a+b-c)
=0
4153

原式=(a2-b2)(a2-b2)
=a4-2a2b2+b4