tính A=5/(√7-√5)-(7-√7)/(√7-1)+6√1/2

Question

tính A=5/(√7-√5)-(7-√7)/(√7-1)+6√1/2

Question

tính
A=5/(√7-√5)-(7-√7)/(√7-1)+6√1/2

in progress 0

Môn Toán Doris 4 years 2020-10-15T03:03:50+00:00 2020-10-15T03:03:50+00:00 1 Answers 96 views 0

Answers ( )

Leave an answer

Name*

E-Mail*

Website

Featured image

Browse

Captcha* Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )

Answer*

About Doris

Farah · Answer 1 · 2020-10-15T03:05:35+00:00

Farah

0

2020-10-15T03:05:35+00:00 October 15, 2020 at 3:05 am

Reply

Đáp án:

$\frac{3 \sqrt{7} + 5 \sqrt{5} + 6 \sqrt{2}}{2}$

Giải thích các bước giải:

$\begin{array}{l} A = \frac{5}{\sqrt{7} - \sqrt{5}} - \frac{7 - \sqrt{7}}{\sqrt{7} - 1} + 6. \sqrt{\frac{1}{2}} \\ = \frac{5 (\sqrt{7} + \sqrt{5})}{7 - 5} - \frac{\sqrt{7} (\sqrt{7} - 1)}{\sqrt{7} - 1} + 3 \sqrt{2} \\ = \frac{5 \sqrt{7} + 5 \sqrt{5}}{2} - \sqrt{7} + 3 \sqrt{2} \\ = \frac{5 \sqrt{7} + 5 \sqrt{5} - 2 \sqrt{7} + 6 \sqrt{2}}{2} \\ = \frac{3 \sqrt{7} + 5 \sqrt{5} + 6 \sqrt{2}}{2} \end{array}$

Login

Register Now