x=10+122
Tìm x ϵ N biết:b) 35 - 5 (x - 1) = 10 c) 24. (x - 16) = 122 d) (x2 - 10) : 5 = 3
\(35-5\left(x-1\right)=10\\ \Leftrightarrow35-5x+5=10\\ \Rightarrow40-5x=10\)
\(\Rightarrow-5x=10-40\\ \Rightarrow-5x=-30\\ \Rightarrow x=\dfrac{-30}{-5}=6\)
c)
\(24\left(x-16\right)=12^2\)
\(\Rightarrow24x-384=144\\ \Rightarrow24x=144+384\\ \Rightarrow24x=528\\ \Rightarrow x=\dfrac{528}{24}=22\)
d)
\(\left(x^2-10\right)\div5=3\\ \Rightarrow\left(x^2-10\right)=3\times5\\ \Rightarrow x^2-10=15\)
\(\Rightarrow x^2=15+10\\ \Rightarrow x^2=25\\ \Rightarrow x^2=5^2\Rightarrow x=5\)
Ơ, bn ơi @Kenny sai sai ở đâu thì phải.
(-1)^10+3.(14+x)=-121-(122)
b1 tìm số tự nhiên x bt
a, 3x X +122=21
b,(36-X):2=10
c, 36-X:2 = 10
a, 3x X +122=21
\(3xX=21-122\)
\(3xX=-101\)
\(X=-101:3\)
\(X=-\frac{101}{3}\)
b,(36-X):2=10
\(36-X=10x2\)
\(36-X=20\)
\(X=36-20\)
\(X=16\)
c, 36-X:2 = 10
\(36-X:2=10\)
\(X:2=36-10\)
\(X:2=26\)
\(X=26x2\)
\(X=52\)
a.3xX+122=21
3xX =21-122
3xX =-101
X =-101:3
X =\(\frac{-101}{3}\)
Tìm x biết lấy x trừ đi 10 cộng cho 2 nhân cho 2 bằng 122
nhanh nha dễ mà
Ta co: X-10+2•2=122
X-10+4 =122
X-14=122
X=122+14
X=136
bài 1.(-15)+(-122)
(7 -10)+3
|-127|-18.(5-6)
bài 2
|x+9|.2=10
Bài 1:
\(-15+\left(-122\right)=-137\)
\(\left(7-10\right)+3=-3+3\)
\(=0\)
\(\left|-127\right|-18.\left(5-6\right)=127-18.\left(-1\right)\)
\(=127-\left(-18\right)\)
\(=145\)
Bài 2:
\(\left|x+9\right|.2=10\)
\(\left|x+9\right|=5\)
\(\Rightarrow\orbr{\begin{cases}x+9=5\\x+9=-5\end{cases}\Rightarrow\orbr{\begin{cases}x=4\\x=-14\end{cases}}}\)
\(\Rightarrow x\in\left\{-14;4\right\}\)
Happy new year!!!
bài 1 :
a) ( - 15 ) + ( - 122 )
= -137
b) ( 7 - 10 ) + 3
= -3 + 3
= 0
c) |-127| - 18 . ( 5 - 6 )
= 127 - 18 . -1
= 127 - (-18)
= 145
Bài 2 :
| x + 9 | . 2 = 10
| x + 9 | = 10 : 2
| x + 9 | = 5
=> x + 9 = 5 hoặc x + 9 = -5
Nếu x + 9 = 5
x = 5 - 9
x = -4
Nếu x + 9 = -5
x = -5 - 9
x = - 14
Vậy x thuộc -4 và -14
Á nhầm =.=
Bài 2:
\(\left|x+9\right|.2=10\)
\(\left|x+9\right|=5\)
\(\Rightarrow\orbr{\begin{cases}x+9=5\\x+9=-5\end{cases}\Rightarrow\orbr{\begin{cases}x=-4\\x=-14\end{cases}}}\)
\(\Rightarrow x\in\left\{-14;-4\right\}\)
tìm ba số x,y,z biết rằng
1/x/2=y/3=z/5 và 2x-y+z=12
2/x/2=y/3,y/4=z/5 và x+y-z=10
122 x 122 =
122 x 122 = 14884
Tìm x
a) 24 x ( x-16) = 122
b) ( x2 -10 ) : 5 = 5
c) ( 5 x + 335 ) : 2 = 400
d) 63 : ( 5x + 4) = 23 -1
Mong các bn giúp mik :< . Làm đc mấy câu cx đc ạ. Cảm ơn các bn
\(a)24\times(x-16)=12^2\\\Rightarrow 24\times(x-16)=144\\\Rightarrow x-16=144:24\\\Rightarrow x-16=6\\\Rightarrow x=6+16\\\Rightarrow x=22\\---\\b)(x^2-10):5=5\\\Rightarrow x^2-10=5\times5\\\Rightarrow x^2-10=25\\\Rightarrow x^2=25+10\\\Rightarrow x^2=35\\\Rightarrow x=\pm\sqrt{35}\\---\)
\(c)(5x+335):2=400\\\Rightarrow 5x+335=400\times2\\\Rightarrow 5x+335=800\\\Rightarrow 5x=800-335\\\Rightarrow 5x=465\\\Rightarrow x=465:5\\\Rightarrow x=93\\---\\d)63:(5x+4)=2^3-1\\\Rightarrow 63:(5x+4)=8-1\\\Rightarrow 63:(5x+4)=7\\\Rightarrow 5x+4=63:7\\\Rightarrow 5x+4=9\\\Rightarrow 5x=9-4\\\Rightarrow 5x=5\\\Rightarrow x=5:5\)
\(\Rightarrow x=1\)
\(Toru\)