выполните умножение:
а)(y-3)(y+3)
б)(1-x)(1+x)
в)(m-n)(m+n)
г)(x+y)(x-y)
д)(x-2)(2+x)
е)(c+a)(a-c)
а)(y-3)(y+3)
б)(1-x)(1+x)
в)(m-n)(m+n)
г)(x+y)(x-y)
д)(x-2)(2+x)
е)(c+a)(a-c)
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Answers & Comments
(1-x)(1+x)=1-xˇ2
(m-n)(m+n)=mˇ2-nˇ2
(x+y)(x-y)=xˇ2-yˇ2
(c+a)(a-c)=(a+c)(a-c)=aˇ2-cˇ2
(A+B)(A-B)= Aˇ2-Bˇ2