2/7ab-3/14a^2b+4/21ab^2 eching

$$\frac { 2 } { 7 a b } - \frac { 3 } { 14 a ^ { 2 } b } + \frac { 4 } { 21 a b ^ { 2 } }$$

Baholash

$$\frac{12ab+8a-9b}{42\left(ab\right)^{2}}$$

Qisqa yechim qadamlari

Ifodalarni qo‘shish yoki ayirish uchun ularni yoyib, maxrajlarini bir xil qiling. 7ab va 14a^{2}b ning eng kichik umumiy karralisi 14ba^{2}. \frac{2}{7ab} ni \frac{2a}{2a} marotabaga ko'paytirish.

$$\frac{2\times 2a}{14ba^{2}}-\frac{3}{14ba^{2}}+\frac{4}{21ab^{2}}$$

\frac{2\times 2a}{14ba^{2}} va \frac{3}{14ba^{2}} da bir xil maxraji bor, ularning suratini ayirish orqali ayiring.

$$\frac{2\times 2a-3}{14ba^{2}}+\frac{4}{21ab^{2}}$$

2\times 2a-3 ichidagi ko‘paytirishlarni bajaring.

$$\frac{4a-3}{14ba^{2}}+\frac{4}{21ab^{2}}$$

Ifodalarni qo‘shish yoki ayirish uchun ularni yoyib, maxrajlarini bir xil qiling. 14ba^{2} va 21ab^{2} ning eng kichik umumiy karralisi 42a^{2}b^{2}. \frac{4a-3}{14ba^{2}} ni \frac{3b}{3b} marotabaga ko'paytirish. \frac{4}{21ab^{2}} ni \frac{2a}{2a} marotabaga ko'paytirish.

$$\frac{\left(4a-3\right)\times 3b}{42a^{2}b^{2}}+\frac{4\times 2a}{42a^{2}b^{2}}$$

\frac{\left(4a-3\right)\times 3b}{42a^{2}b^{2}} va \frac{4\times 2a}{42a^{2}b^{2}} da bir xil maxraji bor, ularning suratini qo‘shish orqali qo‘shing.

$$\frac{\left(4a-3\right)\times 3b+4\times 2a}{42a^{2}b^{2}}$$

\left(4a-3\right)\times 3b+4\times 2a ichidagi ko‘paytirishlarni bajaring.

$$\frac{12ab-9b+8a}{42a^{2}b^{2}}$$

Omil

$$\frac{12ab+8a-9b}{42\left(ab\right)^{2}}$$