| x | - 9 = -2 + 17
|x – 9| = -2 + 17
4/9 x (-13/-17) + (-2/17) x 4/9 + 2/9 x 4/17 = ?
2/9 x 5/17 + 2/9 x 13/17 - 2/9 x 1/17 + 2018 7/9
1168,97+96,45x9-126,14:7
Giúp mk vs
#)Giải :
\(\frac{2}{9}.\frac{5}{17}+\frac{2}{9}.\frac{13}{17}-\frac{2}{9}.\frac{1}{17}+2018\frac{7}{9}\)
\(=\frac{2}{9}\left(\frac{5}{17}+\frac{13}{17}-\frac{1}{17}\right)+2018\frac{7}{9}\)
\(=\frac{2}{9}.1+2018\frac{7}{9}\)
\(=\frac{2}{9}+2018\frac{7}{9}\)
\(=2018\frac{9}{9}=2019\)
#~Will~be~Pens~#
\(\frac{2}{9}\times\frac{5}{17}+\frac{2}{9}\times\frac{13}{17}-\frac{2}{7}\times\frac{1}{17}+2018\frac{7}{9}\)
\(=\frac{2}{9}\times\left(\frac{5}{17}+\frac{13}{17}-\frac{1}{17}\right)+2018\frac{7}{9}\)
\(=\frac{2}{9}\times1+2018\frac{7}{9}\)
\(=\frac{2}{9}+2018\frac{7}{9}\)
\(=\frac{2}{9}+2018+\frac{7}{9}\)
\(=\left(\frac{2}{9}+\frac{7}{9}\right)+2018\)
\(=1+2018=2019\)
~ Hok tốt ~
tính
a)x+5=-2+11 b)-3x=-5+29
c)[x]-9=-2+17 d)[x-9]=-2+17
a)x+5= 9
x=9-5
x=4
b) -3x=24
x=24:-3
x=-8
c) [x]-9=15
[x]=15+9
[x]=24
x=24
d)[x-9]=-2+17
[x-9]=15
[x]=15+9
[x]=24
x=24
a) \(x+5=-2+11\) b)\(-3x=5+29\)
\(\Rightarrow x=-2+11-5\) \(\Rightarrow-3x=24\)
\(\Rightarrow x=4\) \(\Rightarrow-8\)
c)\(\left|x\right|-9=-2+17\) d)\(\left|x-9\right|=-2+17\)
\(\left|x\right|=15+9\) \(\left|x-9\right|=15\)
\(\left|x\right|=24\) \(x-9=15\) hoặc \(x-9=15\)
x = 24 hoặc - 24 \(x=24\) hoặc \(x=-6\)
\(\dfrac{9}{17}\) x \(\dfrac{21}{13}\) + \(\dfrac{9}{17}\) x \(\dfrac{5}{13}\) - \(\dfrac{9}{17}\) x 2
Các bạn giải giúp mình chi tiết nha! Tks
\(\dfrac{9}{17}\times\dfrac{21}{13}+\dfrac{9}{17}\times\dfrac{5}{13}-\dfrac{9}{17}\times2\)
\(=\dfrac{9}{17}\times\left(\dfrac{21}{13}+\dfrac{5}{13}-2\right)\)
\(=\dfrac{9}{17}\times\left(\dfrac{26}{13}-2\right)=\dfrac{9}{17}\times\left(2-2\right)\)
\(=\dfrac{9}{17}\times0=0\)
= 9/17 x ( 21/13 + 5/13 - 2 )
= 9/17 x 0
= 0
=9/17 x (21/13 + 5/13 - 2)
=9/17 x (26/13 - 2)
=9/17 x (13 - 2)
=9/17 x 11
= 99/17
Tick cho mik nhé!!!
Tìm x ∈ Z, biết:
a) x + 5 = -2 + 11
b) -3x = -5 + 29
c) | x | - 9 = -2 + 17
d) | x – 9 | = -2 + 17
a) x = 4
b) x = -8
c) | x | - 9 = -2 + 17
| x | = 15 + 9
| x | = 24
x = 24 hoặc x = -24
d) |x – 9| = -2 + 17
|x – 9| = 15
x – 9 = 15 hoặc x – 9 = -15
x = 24 hoặc x = -6
Tìm x, biết a. 0,5x -2/3x=7/12 b. -8/17+5/17<x/17<-6/17+9/17 c. [x-5/12].9/29=-6/29
\(a,0,5x-\frac{2}{3}x=\frac{7}{12}\Rightarrow\frac{1}{2}x-\frac{2}{3}x=\frac{7}{12}\)
\(\Rightarrow x\left(\frac{1}{2}-\frac{2}{3}\right)=\frac{7}{12}\Rightarrow x\cdot\left(\frac{3}{6}-\frac{4}{6}\right)=\frac{7}{12}\)
\(\Rightarrow x\cdot\left(-1\right)=\frac{7}{12}\Rightarrow x=\frac{7}{12}:\left(-1\right)=\frac{7}{-12}\)
\(c,\frac{\left(x-5\right)}{12}\cdot\frac{9}{29}=\frac{-6}{29}\Rightarrow\frac{\left(x-5\right)}{12}=\frac{-6}{29}:\frac{9}{26}\)
\(\frac{\Rightarrow\left(x-5\right)}{12}=\frac{-6}{9}=\frac{-2}{3}\Rightarrow x-5=-\frac{2}{3}\cdot12\)
\(\Rightarrow x-5=\frac{-24}{3}=-8\Rightarrow x=-8+5=-3\)
\(a,0,5x-\frac{2}{3}x=\frac{7}{12}\)
\(\Rightarrow\frac{1}{2}x-\frac{2}{3}x=\frac{7}{12}\)
\(\Rightarrow-\frac{1}{6}x=\frac{7}{12}\)
\(\Rightarrow x=-\frac{7}{2}\)
\(c,\frac{x-5}{12}\cdot\frac{9}{29}=-\frac{6}{29}\)
\(\Rightarrow\frac{x-5}{12}=-\frac{2}{3}\)
\(\Rightarrow x-5=12.\left(-\frac{2}{3}\right)\)
\(\Rightarrow x-5=-8\)
\(\Rightarrow x=-3\)
b)\(\frac{-8}{17}+\frac{5}{17}< \frac{x}{17}< \frac{-6}{17}+\frac{9}{17}\)\(\left(x\in Z\right)\)
\(\Rightarrow\frac{-3}{17}< \frac{x}{17}< \frac{3}{17}\)
\(\Rightarrow-3< x< 3\)
\(\Rightarrow x\in\left\{-2;-1;0;1;2\right\}\)
Vậy \(x\in\left\{-2;-1;0;1;2\right\}\)
Tìm x thuộc Z , biết :
|x| - 9 = - 2 + 17
| x - 9 | = - 2 + 17
\(\left|x\right|-9=-2+17\)
\(\left|x\right|-9=15\)
\(\left|x\right|=24\)
=> \(\orbr{\begin{cases}x=24\\x=-24\end{cases}}\)
\(\left|x-9\right|=-2+17\)
\(\left|x-9\right|=15\)
=> \(\orbr{\begin{cases}x-9=15\\x-9=-15\end{cases}}\)
=> \(\orbr{\begin{cases}x=24\\x=-6\end{cases}}\)
Tính hợp lý
(2^17 +17^2 ) x (9^15 - 15^9 ) x ( 4^2 -2^4)
\(\left(2^{17}+17^2\right)\left(9^{15}-15^9\right)\left(4^2-2^4\right)\)
\(=\left(2^{17}+17^2\right)\left(9^{15}-15^9\right)\left(16-16\right)\)
\(=\left(2^{17}+17^2\right)\left(9^{15}-15^9\right).0\)
\(=0\)
p/s: chúc bạn học tốt
GPT sau: \(x+\sqrt{17-x^2}+x\sqrt{17-x^2}=9\)
ĐKXĐ: ...
Đặt \(\left\{{}\begin{matrix}u=v\\v=\sqrt{17-x^2}\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}u+v+uv=9\\u^2+v^2=17\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}uv=9-\left(u+v\right)\\\left(u+v\right)^2-2uv=17\end{matrix}\right.\)
\(\Rightarrow\left(u+v\right)^2+2\left(u+v\right)-35=0\)
\(\Rightarrow\left[{}\begin{matrix}u+v=5\Rightarrow uv=4\\u+v=-7\Rightarrow uv=16\end{matrix}\right.\)
\(\Rightarrow...\)