Сократите дробь √21+7/ √7 /- дробная черта. Created by starlight54. algebra-ru

- дробная черта...

ТатМих

Verified answer

21 представим произведением 3*7

7= (√7)²

$\frac{\sqrt{(7*3)}+(\sqrt{7})^2 }{\sqrt{7} } =\frac{\sqrt{7}*(\sqrt{3} +\sqrt{7} ) }{\sqrt{7} } =\sqrt{3} +\sqrt{7}$

5 votes Thanks 4

OblivionFire

$\frac{ \sqrt{21} + 7 }{ \sqrt{7} } = \frac{ \sqrt{21} + 7}{ \sqrt{7} } \times \frac{ \sqrt{7} }{ \sqrt{7} } = \frac{ \sqrt{7} ( \sqrt{21} + 7)}{ \sqrt{7} \times \sqrt{7} } = \frac{ \sqrt{147} + 7 \sqrt{7} }{7} = \frac{7 \sqrt{3} + 7 \sqrt{7} }{7} = \frac{7( \sqrt{3} + \sqrt{7} ) }{7} = \sqrt{3} + \sqrt{7} \\$

или же

$\frac{ \sqrt{21 + 7} }{ \sqrt{7} } = \frac{ \sqrt{28} }{ \sqrt{7} } = \sqrt{4} = 2$

4 votes Thanks 3

Answers & Comments

Verified answer

r3a30 314 646b71f2d2f9c

r3a30 314

3x 10 8x 510 reshit uravnenie

drobnaya cherta v kvadrate

help me please zaranee spasibo5221c7ddcdc3ad9aa19c65b40bf5b313 1709

pomogite pozhalujsta zaranee spasibo4cdadec1bb48598f9a602eb5e776bd2c 19526

ispolzuya formulu a2 b2a baba razlozhi na mnozhiteli vyrazhenie z2 5

osobennosti razmnozheniya golosemennyh

pomogite pozhalujsta uprostite vyrazhenie134a490549551e482e70938256493b77 72100

vnesi mnozhitel pod znak kornya i ukazhi chemu ravno podkorennoe vyrazhenie 67

рекомендуемые вопросы

Helpful Links

Helpful Social