Răspunsuri

2014-05-17T12:24:18+03:00
X²y- 4y=y(x²-4)= y(x-2)(x+2)

x²y²z² -y²= y²(x²z²-1)= y²(xz-1)(xz+1)

a³-5a=a(a²-5)= a(a-√5)(a+√5)
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