Tìm x:
a)
b)
c)
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
a) x = 9867655 - 456788
x = 9410867
b) x = 9886 + 23345
x = 33231
c) x = 986352 - 283476
x = 702876
d) y =44772 : 123
y = 364
e) a = 2345 x 637
a = 1493765
g) x = 212552 : 326
x = 652
Bài 2. Tìm x:
a/ x + 456788 = 9867655
x = 9867655 -456788
x = 9410867
b/ x – 23345 = 9886
x = 9886 + 23345
x =33231
c/ 283476 + x = 986352
x = 986352 - 283476
x= 702876
d/ y × 123 = 44772
y = 44772 : 123
y = 364
e/ a : 637 = 2345
a = 2345 x 637
a = 1493765
g/ 212 552 : x = 326
x = 212 552 : 326
x = 652
h/ 40000 – x =3876
x = 40000 – 3876
x = 36124
i/ (x + 1233) – 1978 = 9876
x + 1233 = 9876 + 1978
x + 1233 = 11854
k/ x : 2 : 3 = 138
x : 2 = 138 x 3
x : 2 =414
x = 414 x 2
x = 828
\(a,\sqrt{9x^2}=2x+1\\ \Leftrightarrow\left[{}\begin{matrix}3x=2x+1,\forall x\ge0\\-3x=2x+1,\forall x< 0\end{matrix}\right.\\ \Leftrightarrow\left[{}\begin{matrix}x=1,\forall x\ge0\left(N\right)\\x=-1,\forall x< 0\left(N\right)\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=1\\x=-1\end{matrix}\right.\)
\(b,\sqrt{x^2+6x+9}=3x-1\\ \Leftrightarrow\sqrt{\left(x+3\right)^2}=3x-1\\ \Leftrightarrow\left[{}\begin{matrix}x+3=3x-1,\forall x+3\ge0\\x+3=1-3x,\forall x+3< 0\end{matrix}\right.\\ \Leftrightarrow\left[{}\begin{matrix}x=2,\forall x\ge-3\left(N\right)\\x=-\dfrac{1}{2},\forall x< -3\left(L\right)\end{matrix}\right.\Leftrightarrow x=2\)
\(c,\sqrt{x^2-2x+4}=2x-3\left(x\in R\right)\\ \Leftrightarrow x^2-2x+4=\left(2x-3\right)^2\\ \Leftrightarrow x^2-2x+4=4x^2-12x+9\\ \Leftrightarrow3x^2-10x+5=0\\ \Delta=100-4\cdot3\cdot5=40\\ \Leftrightarrow\left[{}\begin{matrix}x=\dfrac{10-\sqrt{40}}{6}\\x=\dfrac{10+\sqrt{40}}{6}\end{matrix}\right.\\ \Leftrightarrow\left[{}\begin{matrix}x=\dfrac{5-\sqrt{10}}{3}\\x=\dfrac{5+\sqrt{10}}{3}\end{matrix}\right.\)
\(a.\sqrt{9x^2}=2x+1\)
<=> \(\sqrt{9}x=2x+1\)
<=> 3x = 2x + 1
<=> 3x - 2x = 1
<=> x = 1
a: =>x+5>0
hay x>-5
b: =>2x+1<0
hay x<-1/2
c: =>(x-1)(x-4)>0
=>x>4 hoặc x<1
a) \(x-34,5=15,24+51,02\)
\(x-34,5=66,26\)
\(x\) \(=\) \(66,26+34,5\)
\(x\) \(=\) \(100,76\)
b) \(x-213,47=221,35+67,145\)
\(x-213,47=288,495\)
\(x\) \(=\) \(288,495+213,47\)
\(x\) \(=\) \(501,965\)
a, \(x=\dfrac{9,5}{5}=\dfrac{19}{10}\)
b, \(x=\dfrac{15,12}{42}=\dfrac{9}{25}\)
a: x-2,5=8,17+12,35
=>\(x-2,5=20,52\)
=>\(x=20,52+2,5=23,02\)
b: \(x-30,7=29,4+5,68\)
=>\(x-30,7=35,08\)
=>\(x=35,08+30,7=65,78\)
a: =>x+6,5=6,48
=>x=-0,02
b: =>259,2:x=43,2
=>x=6
c: =>x*5,3=36,04
=>x=6,8
d: =>67,89-x=13,6
=>x=54,29
Tìm x:
a)
b)
c)
hả????
:VVVVV