Oddiy kasrlar va ular ustida amallar bo‘yicha savol

Birinchi navbatda $7\frac{12}{17}$ ni topish uchun butun son $7$ ga kasr $\frac{12}{17}$ ni qo‘shamiz: $7\frac{12}{17}=7+\frac{12}{17}=\frac{7\cdot 17}{17}+\frac{12}{17}=\frac{119+12}{17}=\frac{131}{17}$. Endi $12$ ni ham $\frac{12}{1}$ deb yozib, umumiy maxraj $17$ ga keltiramiz: $12=\frac{12\cdot 17}{17}=\frac{204}{17}$. Farqni topamiz: $12-7\frac{12}{17}=\frac{204}{17}-\frac{131}{17}=\frac{73}{17}$. $\frac{73}{17}$ ni butun va qoldiq shaklga ajratamiz: $73\div 17=4$ qoladi $5$, ya’ni $\frac{73}{17}=4\frac{5}{17}$. Shunday qilib, to‘g‘ri javob **B) $4\frac{5}{17}$**.