(z+3)(z^2-4z+9)
--------------------
1)х²+2х-3≤0
х1+х2=-2 и х1*х2=-3⇒х1=-3 и х2=1
+ _ +
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-3 1
х∈[-3;1]
2)(2x+1)²>0
x=-1
+ +
-------------------------------------------
-1
x∈(-≈;-1)U(-1;≈)
<span>5√2+23√27-√98 =
= 5V2 + 12 V9*3 - V49*2 =
= 5V2 + 12*3V3 - 7V2 =
= - 2V2 + 36V3
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</span>