1-61/21:13/15-42 eching

$$1 - 6 \frac { 1 } { 2 } 1 : \frac { 13 } { 15 } - 42$$

Baholash

$$-\frac{97}{2}=-48,5$$

Yechim qadamlari

12 hosil qilish uchun 6 va 2 ni ko'paytirish.

$$1-\frac{\frac{12+1}{2}\times 1}{\frac{13}{15}}-42$$

13 olish uchun 12 va 1'ni qo'shing.

$$1-\frac{\frac{13}{2}\times 1}{\frac{13}{15}}-42$$

\frac{13}{2} hosil qilish uchun \frac{13}{2} va 1 ni ko'paytirish.

$$1-\frac{\frac{13}{2}}{\frac{13}{15}}-42$$

\frac{13}{2} ni \frac{13}{15} ga bo'lish \frac{13}{2} ga k'paytirish \frac{13}{15} ga qaytarish.

$$1-\frac{13}{2}\times \frac{15}{13}-42$$

Suratni maxrajga va maxrajini suratga ko‘paytirish orqali \frac{13}{2} ni \frac{15}{13} ga ko‘paytiring.

$$1-\frac{13\times 15}{2\times 13}-42$$

Surat va maxrajdagi ikkala 13 ni qisqartiring.

$$1-\frac{15}{2}-42$$

1 ni \frac{2}{2} kasrga o‘giring.

$$\frac{2}{2}-\frac{15}{2}-42$$

\frac{2}{2} va \frac{15}{2} da bir xil maxraji bor, ularning suratini ayirish orqali ayiring.

$$\frac{2-15}{2}-42$$

-13 olish uchun 2 dan 15 ni ayirish.

$$-\frac{13}{2}-42$$

42 ni \frac{84}{2} kasrga o‘giring.

$$-\frac{13}{2}-\frac{84}{2}$$

-\frac{13}{2} va \frac{84}{2} da bir xil maxraji bor, ularning suratini ayirish orqali ayiring.

$$\frac{-13-84}{2}$$

-97 olish uchun -13 dan 84 ni ayirish.

$$-\frac{97}{2}$$

Omil

$$-\frac{97}{2} = -48\frac{1}{2} = -48,5$$