giup minh cau nay voi a: (2 √18 + 3 √8 – 6 √2) : √2

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giup minh cau nay voi a: (2 √18 + 3 √8 – 6 √2) : √2

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Môn Toán Kiệt Gia 4 years 2020-11-24T13:08:26+00:00 2020-11-24T13:08:26+00:00 2 Answers 70 views 0

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

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Euphemia · Answer 1 · 2020-11-24T13:09:30+00:00

Euphemia

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2020-11-24T13:09:30+00:00 November 24, 2020 at 1:09 pm

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$(2 \sqrt{18} + 3 \sqrt{8} - 6 \sqrt{2}) : \sqrt{2}$

$= (2. \sqrt{9.2} + 3 \sqrt{4.2} - 6 \sqrt{2}) : \sqrt{2}$

$= (2.3 \sqrt{2} + 3.2 \sqrt{2} - 6 \sqrt{2}) : \sqrt{2}$

$= (6 \sqrt{2} + 6 \sqrt{2} - 6 \sqrt{2}) : \sqrt{2}$

$= 6 \sqrt{2} : \sqrt{2}$

$= 6$

Sapo1 · Answer 2 · 2020-11-24T13:09:39+00:00

Sapo1

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2020-11-24T13:09:39+00:00 November 24, 2020 at 1:09 pm

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a) ( $2 \sqrt{18} + 3 \sqrt{8} - 6 \sqrt{2}$ ): $\sqrt{2}$

= ( $2 \sqrt{3^{2} .2} + 3 \sqrt{2^{2} .2} - 6 \sqrt{2}$ ): $\sqrt{2}$

= ( $2.3 \sqrt{2} + 3.2 \sqrt{2} - 6 \sqrt{2}$ ): $\sqrt{2}$

= ( $6 \sqrt{2} + 6 \sqrt{2} - 6 \sqrt{2}$ ): $\sqrt{2}$

= [ $\sqrt{2} (6 + 6 - 6)$ ]: $\sqrt{2}$

= $6 \sqrt{2}$ : $\sqrt{2}$

= 6

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