20 БАЛОВ!
Докажите тождество:
2) x•(y-2)+2•(x+y)=y•(x+2)=
3) m•(m-n)+2mn=m•(m+n)=
4) x•(1-x)+x•(x²-1)=x²•(x-1)=
запишите так как в тетрадь писать и полностью пж​
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