Հանրահաշիվ Դասարանական և Տնային աշխատանքներ

ա) (a+1)(a+1)=a2+a+a+1=a2+2a+1

բ) (x+1)(x+2)=x2+2x+x+2=x2+3x+2

գ) (2+y)(y+3)=2y+6+y2+3y

դ) (a+b)(a+b)=a2+ab+ba+b2=a2+2ab+b2

ե) (1+x)(1-x)=1+x+x-x

զ) (a-2)(3-a)=3a-a2-6+2a

է) (x-y)(x+y)=x2+xy-xy-y2=x2-y2

ը) (a-b)(a-b)=a2-ab-ab+b2=a2-2ab+b2

թ) (2a+b)(a+2b)=2a2+4ab+ab+2b2=2a2+5ab+2b2

ժ) (3x+2y)(3x+2y)=9x2+6xy+6xy+4y2=9x2+12xy+4y2

ա) (5m + 7n)(2n + 4m)=10mn+20m2+14n2+28mn=20m2+38mn+14n2

բ) (12a + b)(3a + 5b)=36a2+60ab+3ab+5b2=36a2+63ab+5b2

գ) (2x − 3y)(2x + 3y)=4x2+6xy-6xy-6y2=4x2-6y2

դ) (5m − 2n)(3n − 5m)=15mn-25m2-6n2+10mn=25m2-25mn+6n2

ե)(-а – b)(2a – 3b) = -2a2 + 3ab – 2ab + 3b2 = -2a2 + ab + 3b2

զ)(-7x – 4y)(-5x + 7y) = -35x2 – 49xy + 20xy – 28y2 = -35x2 – 29xy – 28y2

է)(a2 + b2)(a2 + b2) = a4 + a2b2 + a2b2 + b4 = a4 + 2a2b2 + b4

ը)(mn3 – m2)(m – 1) = m2n3 – mn3 – m3 + m2

թ)(2x2 – y2)(y2 + 2x3) = 2x2y2 + 4x5 – y4 + 2x3y2

ժ) (xy2+3a2)(3xy+a3)=3x2y3+a3xy2+9a2xy+3a5

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