HOC24
Lớp học
Môn học
Chủ đề / Chương
Bài học
1. Cho \(b^2=ac\) ; \(c^2=bd\)
Chứng minh rằng :
\(\dfrac{a^3+b^3+c^3}{b^3+c^3+d^3}=\dfrac{a}{d}\)
2.Tìm x1; x2 ;x3 ; ... ; x9 biết:
\(\dfrac{x1-1}{9}=\dfrac{x2-2}{8}=\dfrac{x3-3}{7}=...=\dfrac{x9-9}{1}\)
và x1 + x2 + x3 + ... +x9 = 900
1. D
2. C
3. C
4. D
\(\Rightarrow\)(x - 1)5 = -(2)5
\(\Rightarrow\) x - 1 = - 2
\(\Rightarrow\) x = -2 + 1
\(\Rightarrow\) x = - 1
1.Tính x + y :
\(\dfrac{4^x}{2^{x+y}}\) = 8 và \(\dfrac{9^{x+y}}{3^{5y}}\) = 243
2.Tìm x, biết :
a) \(\left(x-1\right)^3\) = 343
b) \(\left(x-2\right)^4\) = 4096
c) \(\left(x-4\right)^2\) = \(\left(x-4\right)^4\)
Tìm x, biết :
a) ( x - 3 / 2) < 0
b) ( x- 1 / x+ 1) = 0
c) ( x + 3 / x ) > 0
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