【2(a-b)³-8(a-b)²(a+b)+6b(a-b)²】/2(a-b)²
=【2(a-b)³-8(a-b)³+6b(a-b)²】/2(a-b)²
=【-6(a-b)³+6b(a-b)²】/2(a-b)²
=-3(a-b)+3
=-3a+3b+3
【2(a-b)³-8(a-b)²(a+b)+6b(a-b)²】/2(a-b)²
=【2(a-b)³-8(a-b)³+6b(a-b)²】/2(a-b)²
=【-6(a-b)³+6b(a-b)²】/2(a-b)²
=-3(a-b)+3
=-3a+3b+3