Հանրահաշիվ Դասարանական աշխատանք

ա) (a+1)(a+1)(a+1)=(a+1)(a2+a+a+1)=(a+1)(a2+2a+1)=a3+2a2+a+a2+2a+1=a3+3a2+3a+1

գ) (a+b)(a-b)(a+b)=(a+b)(a2+ab-ab-b)=(a+b)(a2-b)=a3-ab+a2b-b

ե) (a+b+c)(a+1)=a2+a+ab+b+ac+c

է) (x+1)(x2-x+1)=x3-x2+x+x2-x+1=x3+1

թ) (x3+2x-3)(2-3x)=2x3-3x4+4x-6x2-6+9x=2x3-3x4+13x-6x2-6

ի) (a+b+c)(a+b-c)=a2+ab-ac+ab+b2-bc+ac+bc-c2=a2+2ab+b2-c2

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

գ) –(x-y)(x-y)=-(x2-xy-xy+y2)=-(x2-2xy+y2)=-x2+2xy-y2

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

ա) (8x-3)(4x+5)=32x2+40x-12x-15=32x2+28x-15

գ) (4a-3)*2a-3=8a2-12a-6a+9=8a2-18a+9

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