Posted in Հանրահաշիվ 7

128-131

128.-ա)(-a-b)(a+b)=-a2-ab-ba-b2=-a2-2ab-b2

բ)(-x+y)(x+y)=-x2-xy+yx+y2=-x2+y2

գ)(-x+y)(x-y)=-x2+xy+yx-y2=-x2+2xy-y2

դ)(-2m+n)(n-3m)=-2mn+6m2+n2-3mn=-5mn+6m2+n2

ե)(-5a+2b)(3b+2a)=-15ab-10a2+6b2+4ab=-11ab-10a2+6b2

զ)(-7x-56y)(y-3x)=-7xy+21×2-56y2+168xy=+161xy+21×2-56y2

ա)a3-2a2b+4b2a+2ba2-4b2a+8b3=a3+8b3

բ)a2+ab-ac-ba-b2+bc+ac+bc-c2=a2-ba-b2+2bc-c2

գ)(a2-2ba+2ab-4b2)(a2+4b2)=2a4+4a2b2-2a3b-8b3a+2a3b+8ab3-4b2a2-16b4=2a4-16b4

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