Giúp mình với ! Mình cần gấp .

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Giúp mình với ! Mình cần gấp .
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Môn Toán Bơ 4 years 2020-10-15T00:48:57+00:00 2020-10-15T00:48:57+00:00 1 Answers 91 views 0

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

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Ben · Answer 1 · 2020-10-15T00:50:52+00:00

Ben

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2020-10-15T00:50:52+00:00 October 15, 2020 at 12:50 am

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$\frac{128}{2^{2 n}}$ $= 2$

$128 = {2.2}^{2 n}$

$128 = 2^{1 + 2 n}$

$2^{7} = 2^{1 + 2 n}$

$7 = 1 + 2 n$

$1 + 2 n = 7$

$2 n = 7 - 1$

$2 n = 6$

$n = 6 : 2$

$n = 3$