1.6-bo'lim : Ratsional ifodalar
9. Quyidagi ifodada ko'rsatilgan amalni bajaring.
\[\frac{2}{{3{x^2}}} - \frac{1}{{9{x^4}}} + \frac{2}{{x + 4}}\]Yechim
Bu ratsional ifoda uchun birinchi navbatda eng kichik umumiy maxraj kerak.
\[{\mbox{lcd : }}9{x^4}\left( {x + 4} \right)\]2-qadam
Endi har bir atamaning maxrajiga eng kichik umumiy maxrajni olish uchun uni tegishli miqdorga ko'paytiring.
\[\frac{2}{{3{x^2}}} - \frac{1}{{9{x^4}}} + \frac{2}{{x + 4}} = \frac{{2\left( {3{x^2}} \right)\left( {x + 4} \right)}}{{3{x^2}\left( {3{x^2}} \right)\left( {x + 4} \right)}} - \frac{{1\left( {x + 4} \right)}}{{9{x^4}\left( {x + 4} \right)}} + \frac{{2\left( {9{x^4}} \right)}}{{\left( {x + 4} \right)\left( {9{x^4}} \right)}}\]3-qadam
Biz hozir qilishimiz kerak bo'lgan narsa ayirish va qo'shishni bajarib, natijaning hisobini soddalashtirishdir.
\[\frac{2}{{3{x^2}}} - \frac{1}{{9{x^4}}} + \frac{2}{{x + 4}} = \frac{{6{x^3} + 24{x^2} - \left( {x + 4} \right) + 18{x^4}}}{{9{x^4}\left( {x + 4} \right)}} = \require{bbox} \bbox[2pt,border:1px solid black]{{\frac{{18{x^4} + 6{x^3} + 24{x^2} - x - 4}}{{9{x^4}\left( {x + 4} \right)}}}}\]