3) tìm x:
a) \(x^2=\dfrac{1}{16}\)
b)\(x^5\div x^2=\dfrac{-1}{64}\)
c)\(x^3\div x^2=\dfrac{32}{243}\)
d)\(\left(x^2\right)^2=\dfrac{81}{16}\)
3) Tìm x
a) \(^{x^2}\)=\(\dfrac{1}{16}\)
<=> x = \(\sqrt{-\dfrac{1}{16}}\)
\(\sqrt{\dfrac{1}{16}}\)
<=> x = -14
+14
b) \(x^{5^{ }}\): \(x^2\) = \(-\dfrac{1}{64}\)
<=> \(^{x^{5-2}}\) =\(-\dfrac{1}{64}\)
<=> \(x^3\) = \(-\dfrac{1}{64}\)
<=> x = \(-\dfrac{1}{4}\)
c)\(x^3:x^2\) = \(\dfrac{32}{243}\)
<=> \(^{x^{3-2}}\) = \(\dfrac{32}{243}\)
<=> x = \(\dfrac{32}{243}\)
d) \((x^2)^2\) = \(\dfrac{81}{16}\)
<=>\(^{x^{2.2}}\) = \(\dfrac{81}{16}\)
<=> \(x^4\) = \(\dfrac{81}{16}\)
<=> x = \(\dfrac{3}{2}\)
\(-\dfrac{3}{2}\)
Tìm x, biết:
\(\left(4x-3\right)^2=\left(4x-3\right)\)
Giúp mik nha.
Chìu nay mik nộp rồi .
\(\dfrac{2^{15}.9^4}{6^6.8^3}\)
bài 1 cho B = \(\dfrac{1}{2}+\left(\dfrac{1}{2}\right)^2+...+\left(\dfrac{1}{2}\right)^{99}\)
CMR :
a) B <1
b) B ko là số nguyên
Tìm n \(\in\) N biết: \(3^n.2^n=216\)
1,Tìm x thuộc Q biết
a,\(\left(3x-1\right)^4=81\)
b,\(\left(x+1\right)^5=32\)
Chung minh rang
a,76+75-74\(⋮\)11
b,109+108+107\(⋮\)222
a) (0, 5)2
b) (0, 5)3
c) (9, 7)0
So sánh :
\(\dfrac{2^{2010}+1}{2^{2007}+1}\) và\(\dfrac{2^{2012}+1}{2^{2009}+1}\)
Tìm x,biết: a)x : \((\dfrac{3}{4})^{3} = (\dfrac{3}{4})^{2} \) b) \(\dfrac{2}{5}^{5} . x = \dfrac{2}{5}^{8}\)
Chứng minh rằng:
M = \(\dfrac{1}{3}+\dfrac{2}{3^2}+\dfrac{3}{3^3}+\dfrac{4}{3^4}+...+\dfrac{100}{3^{100}}\)<\(\dfrac{3}{4}\)
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