Tìm x là các số tự nhiên,biết:
a)\(\frac{x+1}{2}=\frac{8}{x+1}\)
b)\(x\div\left(9\frac{1}{2}-\frac{3}{2}\right)=\frac{0,4+\frac{2}{9}-\frac{2}{11}}{1,6+\frac{8}{9}-\frac{8}{11}}\)
Tìm x là số tự nhiên biết :
x:\(\left(9\frac{1}{2}-\frac{3}{2}\right)\)=\(\frac{0,4+\frac{2}{9}-\frac{2}{11}}{1,6+\frac{8}{9}+\frac{8}{11}}\)
Tìm x, biết:
a)\(\frac{x+1}{2}=\frac{8}{x+1}\)
b)\(x:\left(9\frac{1}{2}-\frac{3}{2}\right)=\frac{0,4+\frac{2}{9}-\frac{2}{11}}{1,6+\frac{8}{9}-\frac{8}{11}}\)
a. \(\frac{x+1}{2}=\frac{8}{x+1}\)
\(\Leftrightarrow\left(x+1\right).\left(x+1\right)=8.2\)
\(\Leftrightarrow\left(x+1\right)^2=16\)
\(\Leftrightarrow\left(x+1\right)^2=2^4\)
\(\Leftrightarrow\left(x+1\right)=2^2\)
\(\Leftrightarrow\left(x+1\right)=4\)
\(\Leftrightarrow x=4-1=3\)
b. \(x:\left(9\frac{1}{2}-\frac{3}{2}\right)=\frac{0,4+\frac{2}{9}-\frac{2}{11}}{1,6+\frac{8}{9}-\frac{8}{11}}\)
\(\Leftrightarrow x:\left(\frac{10}{2}-\frac{3}{2}\right)=\frac{0,4+0,2-0,18}{1,6+0,8-0,72}\)
\(\Leftrightarrow x:\frac{7}{2}=\frac{\frac{21}{50}}{\frac{42}{25}}\)
\(\Leftrightarrow x=\frac{\frac{21}{50}}{\frac{42}{25}}.\frac{7}{2}\Leftrightarrow x=\frac{1}{4}.\frac{7}{2}=\frac{7}{8}\)
a ) \(\frac{x+1}{2}=\frac{8}{x+1}\)
\(\Rightarrow\left(x+1\right).\left(x+1\right)=2.8\)
\(\Rightarrow\left(x+1\right)^2=16\)
\(\Rightarrow\orbr{\begin{cases}x+1=4\\x+1=-4\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=4-1\\x=-4-1\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=3\\x=-5\end{cases}}\)
Dấu " \(\orbr{\begin{cases}\\\end{cases}}\)là hoặc nha !!!
a)\(\frac{x+1}{2}=\frac{8}{x+1}\)
\(\Rightarrow\left(x+1\right)^2=8\times2=16\)
\(\Rightarrow\left(x+1\right)^2=4^2\)
\(\Rightarrow x+1=4\)
\(\Rightarrow x=4-1=3\)
b)tớ ko biết làm . ~ sorry~
~chuk bn hok giỏi~
Tìm x là các số tự nhiên,biết:
a)\(\frac{x+1}{2}\)=\(\frac{8}{2c+1}\)
b)x:(9\(\frac{1}{2}\)-\(\frac{3}{2}\))=\(\frac{0,4+\frac{2}{9}-\frac{2}{11}}{1,6+\frac{8}{9}-\frac{8}{11}}\)
Tìm x\(x:\left(9\frac{1}{2}-\frac{3}{2}\right)=\frac{0,4+\frac{2}{9}-\frac{2}{11}}{1,6+\frac{8}{9}-\frac{8}{11}}\)
x:(19:2-3:2)=(2:5+2:9-2:11):(8:5+8:9-8:11)
x:8=2(1:5+1:9-1:11):8(1:5+1:9-1:11)
x:8=1:6
x=(1:6)8
x=4:3
vì không viết được phân số nên mình đành dùng dấu chia thông cảm
Tìm x biết
\(x:\left(9\frac{1}{2}-\frac{3}{2}\right)=\frac{0,4+\frac{2}{9}-\frac{2}{11}}{1,6+\frac{8}{9}-\frac{8}{11}}\)
Giúp mình nhé, giải cụ thể giùm mình luôn nha
Tìm x, biết:
\(x:\left(9\frac{1}{2}-\frac{3}{2}\right)=\frac{0,4+\frac{2}{9}-\frac{2}{11}}{1,6+\frac{8}{9}-\frac{8}{11}}\)
Giúp mình nhé, mình đang cần gấp. À mà các bạn giải cụ thể giùm mình nha!
Tìm x, biết:
a, \(x-\left(\frac{50x}{100}+\frac{25x}{200}\right)=11\frac{1}{4}\) b,\(\left(x-5\right).\frac{30}{100}=\frac{200x}{100}+5\)
c,\(\frac{x+1}{2}=\frac{8}{x+1}\) d, \(x:\left(9\frac{1}{2}-\frac{3}{2}\right)=\frac{0,4+\frac{2}{9}-\frac{2}{11}}{1,6+\frac{8}{9}-\frac{8}{11}}\)
\(c,\frac{x+1}{2}=\frac{8}{x+1}\)
\(\Rightarrow(x+1)(x+1)=2.8\)
\(\Rightarrow(x+1)^2=16\)
\(\Rightarrow(x+1)^2=4^2\)
\(\Rightarrow x+1=4\)
\(\Rightarrow x=4-1\)
\(\Rightarrow x=3\)
\(a,x-(\frac{50x}{100}+\frac{25x}{200})=11\frac{1}{4}\)
\(\Rightarrow x-\frac{50x+25x}{100}=\frac{45}{4}\)
\(\Rightarrow\frac{100x}{100}-\frac{75x}{100}=\frac{45}{4}\)
\(\Rightarrow\frac{100x-75x}{100}=\frac{1125}{100}\)
\(\Rightarrow25x=1125\)
\(\Rightarrow x=45\)
\(b,(x-5)\frac{30}{100}=\frac{200x}{100}+5\)
\(\Rightarrow\frac{30x}{100}-\frac{3}{2}=\frac{200x}{100}+5\)
\(\Rightarrow\frac{30x}{100}-\frac{200x}{100}=5+\frac{3}{2}\)
\(\Rightarrow\frac{-170x}{100}=\frac{13}{2}\)
\(\Rightarrow\frac{-170x}{100}=\frac{650}{100}\)
\(\Rightarrow-170x=650\)
\(\Rightarrow x=\frac{-65}{17}\)
x : ( \(9\frac{1}{2}-\frac{3}{2}\)) \(=\frac{0,4+\frac{2}{9}-\frac{2}{11}}{1,6+\frac{8}{9}-\frac{8}{11}}\)
\(x\div\left(9\frac{1}{2}-\frac{3}{2}\right)=\frac{0,4+\frac{2}{9}-\frac{2}{11}}{1,6+\frac{8}{9}-\frac{8}{11}}\)
\(\Leftrightarrow x\div\left(\frac{19}{2}-\frac{3}{2}\right)=\frac{0,4+\frac{2}{9}-\frac{2}{11}}{4\left(0,4+\frac{2}{9}-\frac{2}{11}\right)}\)
\(\Leftrightarrow x\div\frac{16}{2}=\frac{1}{4}\)
\(\Leftrightarrow x\div8=\frac{1}{4}\)
\(\Leftrightarrow x=\frac{1}{4}\times8\)
\(\Leftrightarrow x=2\)
\(x:\left(9\frac{1}{2}-\frac{3}{2}\right)=\frac{0,4+\frac{2}{9}-\frac{2}{11}}{1,6+\frac{8}{9}-\frac{8}{11}}\)
\(x:\left(\frac{19}{2}-\frac{3}{2}\right)=\frac{0,4+\frac{2}{9}-\frac{2}{11}}{1,6+\frac{8}{9}-\frac{8}{11}}\)
\(x:8=\frac{0,4+\frac{2}{9}-\frac{2}{11}}{1,6+\frac{8}{9}-\frac{8}{11}}\)
Xét : \(\frac{0,4+\frac{2}{9}-\frac{2}{11}}{1,6+\frac{8}{9}-\frac{8}{11}}=\frac{0,4+\frac{2}{9}-\frac{2}{11}}{4.0,4+4.\frac{2}{9}-4.\frac{2}{11}}\)\(=\frac{0,4+\frac{2}{9}-\frac{2}{11}}{4\left(0,4+\frac{2}{9}-\frac{2}{11}\right)}=\frac{1}{4}\)
Thay vào biểu thức có : \(x:8=\frac{1}{4}\)
\(\Rightarrow x=\frac{1}{4}.8=2\)
\(x:\left(9\frac{1}{2}-\frac{3}{2}\right)=\frac{0,4+\frac{2}{9}-\frac{2}{11}}{1,6+\frac{8}{9}-\frac{8}{11}}\)
\(x:\left(\frac{19}{2}-\frac{3}{2}\right)=\frac{\frac{2}{5}+\frac{2}{9}-\frac{2}{11}}{\frac{8}{5}+\frac{8}{9}-\frac{8}{11}}\)
\(x:8=\frac{2\left(\frac{1}{5}+\frac{1}{9}-\frac{1}{11}\right)}{8\left(\frac{1}{5}+\frac{1}{9}-\frac{1}{11}\right)}\)
\(x:8=\frac{2}{8}\)
\(x=\frac{2}{8}.8\)
\(x=2\)
~ Hok tốt ~
Tìm x:
a,\(\frac{x+1}{2}=\frac{8}{x+1}\) b,\(x:\left(9\frac{1}{2}-\frac{3}{2}\right)=\frac{0,4+\frac{2}{9}-\frac{2}{11}}{1,6+\frac{8}{9}-\frac{8}{11}}\)
c, x + (x + 1) + (x + 2) +...+ (x + 30)=1240 d) \(\frac{5}{1.6}+\frac{5}{6.11}+...+\frac{5}{\left(5x\right)+1\left(5x\right)+6}=\frac{2005}{2006}\)
a,\(\frac{x+1}{2}\)\(=\frac{8}{x+1}\)
\(\Leftrightarrow\)(x+1)\(\times\)(x+1) = 8 \(\times\)2
\(\Leftrightarrow\)(x+1)2 = 16
\(\Leftrightarrow\)(x+1)2 = 42
\(\Rightarrow\)x+1 = 4
\(\Rightarrow\)x = 4 - 1
\(\leftrightarrow\)x = 3