Rút gọn các biểu thức sau

Question

Rút gọn các biểu thức sau

Question

Rút gọn các biểu thức sau
rut-gon-cac-bieu-thuc-sau

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Môn Toán King 4 years 2020-10-14T04:08:23+00:00 2020-10-14T04:08:23+00:00 2 Answers 108 views 0

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

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quangkhai · Answer 1 · 2020-10-14T04:10:19+00:00

quangkhai

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2020-10-14T04:10:19+00:00 October 14, 2020 at 4:10 am

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Đáp án:

$= 21$

Giải thích các bước giải:

$(\sqrt{28} - 2 \sqrt{3} + \sqrt{7}) . \sqrt{7} + \sqrt{84}$

$= (\sqrt{4.7} - 2 \sqrt{3} + \sqrt{7}) . \sqrt{7} + \sqrt{84}$

$= (2 \sqrt{7} - 2 \sqrt{3} + \sqrt{7}) . \sqrt{7} + \sqrt{84}$

$= (3 \sqrt{7} - 2 \sqrt{3}) . \sqrt{7} + \sqrt{84}$

$= 3 \sqrt{7.7} - 2 \sqrt{3.7} + \sqrt{84}$

$= 3.7 - 2 \sqrt{21} + 2 \sqrt{21}$

$= 21$

Adela · Answer 2 · 2020-10-14T04:10:20+00:00

Adela

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2020-10-14T04:10:20+00:00 October 14, 2020 at 4:10 am

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$(\sqrt{28} - 2 \sqrt{3} + \sqrt{7}) . \sqrt{7} + {\sqrt{84}}_{}$

$= (2 \sqrt{7} - 2 \sqrt{3} + \sqrt{7}) . \sqrt{7} + 2 {\sqrt{21}}_{}$

$= (3 \sqrt{7} - 2 \sqrt{3}) . \sqrt{7} + 2 {\sqrt{21}}_{}$

$= 21 - 2 \sqrt{21} + 2 {\sqrt{21}}_{}$

$= 21_{}$

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