$b\ge0$ va $b\ne25$ bo‘lganda kasrni qisqartiring: $\dfrac{b\sqrt b-125}{b-10\sqrt b+25}$.
- A. $b-5\sqrt{b}+25$
- B. $b+25$
- C. $\dfrac{b+5\sqrt b+25}{\sqrt b-5}$
- D. $\dfrac{b+5\sqrt b+25}{\sqrt b+5}$
Ildizli ifodalar bo‘yicha savol
Javob va yechimni ko‘rish
Javob: $\dfrac{b+5\sqrt b+25}{\sqrt b-5}$
$t=\sqrt b$ desak, surat $(t-5)(t^2+5t+25)$, maxraj $(t-5)^2$. Bitta $t-5$ qisqaradi.
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