Toán Lớp 8: ptđttnt : ab(a+b)-bc(b+c)-ac(a+c)
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Toán Lớp 8: ptđttnt : ab(a+b)-bc(b+c)-ac(a+c)
mn giúp mình với ạ
Comments ( 1 )
=ab(a-b) -bc(a-b) -bc(c-a) +ac(c-a)
=(a-b)(ab-bc) +(c-a)(ac-bc)
=(a-b) b (a-c) + (c-a) c (a-b)
=(a-b)(a-c)(b-c)