x=-3/7

Nha bạn bạn nhân thử biết liền

\(x^3=-\frac{27}{343}\)

\(x^3=\left(-\frac{3}{7}\right)^3\)

\(x=-\frac{3}{7}\)

\(x^3\)=\(\left(\frac{-3}{7}\right)^3\)

\(x\)=\(\frac{-3}{7}\)

Bài làm:

Ta có: \(\sqrt{3}x-\sqrt{27}=\sqrt{343}\)

\(\Leftrightarrow\left(x-3\right)\sqrt{3}=7\sqrt{7}\)

\(\Leftrightarrow x-3=\frac{7\sqrt{21}}{3}\)

\(\Rightarrow x=\frac{9+7\sqrt{21}}{3}\)

Có x³ = \(\left(-\frac{3}{7}\right)^3\) => x - -3/7

\(=\left(\frac{1+\frac{1}{3}+\frac{1}{9}+\frac{1}{27}}{2\left(1+\frac{1}{3}+\frac{1}{9}+\frac{1}{27}\right)}:\frac{4\left(1-\frac{1}{7}+\frac{1}{49}-\frac{1}{343}\right)}{1-\frac{1}{7}+\frac{1}{49}-\frac{1}{343}}\right):\frac{919191}{808080}\)

\(=\left(\frac{1}{2}:4\right):\frac{919191}{808080}=\frac{1}{8}\cdot\frac{808080}{919191}=\frac{10}{91}\)

                                                Bài giải

      \(\left(\frac{1+\frac{1}{3}+\frac{1}{9}+\frac{1}{27}}{2+\frac{2}{3}+\frac{2}{9}+\frac{2}{27}}\text{ : }\frac{4-\frac{4}{7}+\frac{4}{49}-\frac{4}{343}}{1-\frac{1}{7}+\frac{1}{49}-\frac{1}{343}}\right)\text{ : }\frac{919191}{808080}\)

\(=\left(\frac{1+\frac{1}{3}+\frac{1}{9}+\frac{1}{27}}{2\left(1+\frac{1}{3}+\frac{1}{9}+\frac{1}{27}\right)}\text{ : }\frac{4\left(1-\frac{1}{7}+\frac{1}{49}-\frac{1}{343}\right)}{1-\frac{1}{7}+\frac{1}{49}-\frac{1}{343}}\right)\text{ : }\frac{91}{80}\)

\(=\left(\frac{1}{2}\text{ : }\frac{4}{1}\right)\text{ : }\frac{91}{80}=\frac{1}{8}\text{ : }\frac{91}{80}=\frac{10}{91}\)

                                                Bài giải

      \(\left(\frac{1+\frac{1}{3}+\frac{1}{9}+\frac{1}{27}}{2+\frac{2}{3}+\frac{2}{9}+\frac{2}{27}}\text{ : }\frac{4-\frac{4}{7}+\frac{4}{49}-\frac{4}{343}}{1-\frac{1}{7}+\frac{1}{49}-\frac{1}{343}}\right)\text{ : }\frac{919191}{808080}\)

\(=\left(\frac{1+\frac{1}{3}+\frac{1}{9}+\frac{1}{27}}{2\left(1+\frac{1}{3}+\frac{1}{9}+\frac{1}{27}\right)}\text{ : }\frac{4\left(1-\frac{1}{7}+\frac{1}{49}-\frac{1}{343}\right)}{1-\frac{1}{7}+\frac{1}{49}-\frac{1}{343}}\right)\text{ : }\frac{91}{80}\)

\(=\left(\frac{1}{2}\text{ : }\frac{4}{1}\right)\text{ : }\frac{91}{80}=\frac{1}{8}\text{ : }\frac{91}{80}=\frac{10}{91}\)

a/ => (n - 1)³ = 2³ => n - 1 = 2 => n = 3

b/ => n + 1 = 3 => n = 2 

hoặc n + 1 = -3 => n = -4

c/ => (2n + 1)³ = 7³ => 2n + 1= 7 => 2n = 6 => n = 3

d/ => (n - 2)³ = 3³=> n - 2 = 3 => n =5

a,

(n-1)^3=8

(n-1)^3=2^3

=>n-1=2

n=2+1

n=3

b,(n+1)^2=9

(n+1)^2=3^2

=>n+1=3

n=3-2

n=1

tương tự như mấy câu trên

c,n=6

d,n=5

=182.\(\orbr{\begin{cases}1.\left(\frac{1}{3}+\frac{1}{9}+\frac{1}{27}\right)\\2.\left(\frac{1}{2}+\frac{1}{9}+\frac{1}{27}\right)\end{cases}}:\frac{4.\left(\frac{1}{7}+\frac{1}{9}-\frac{1}{343}\right)}{1.\left(\frac{1}{3}+\frac{1}{49}-\frac{1}{343}\right)}:\frac{91}{80} \)

=.\(182.\left(\frac{1}{2}:\frac{4}{1}\right).\frac{91}{80}\)

=\(182.\frac{1}{8}.\frac{91}{80}\)

=.\(182.\frac{91}{640}\)

=\(\frac{8281}{320}\)

\(=182.\left[\frac{1+\frac{1}{3}+\frac{1}{9}+\frac{1}{27}}{2.\left(1+\frac{1}{3}+\frac{1}{9}+\frac{1}{27}\right)}:\frac{4.\left(1-\frac{1}{7}+\frac{1}{9}-\frac{1}{343}\right)}{1-\frac{1}{7}+\frac{1}{9}-\frac{1}{343}}\right]:\frac{919191}{808080}\)

\(=182.\frac{1}{8}.\frac{808080}{919191}=\frac{182}{8}.\frac{80}{91}=20\)

kiên trì ha