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\(a,35:x+12\cdot4=55\)
\(\Rightarrow35:x+48=55\)
\(\Rightarrow35:x=55-48=7\)
\(\Rightarrow x=35:7\)
\(\Rightarrow x=5\)
\(b,36-4\left(2x-1\right)=4^5:4^3\)
\(\Rightarrow36-4\cdot\left(2x-1\right)=4^2\)
\(\Rightarrow36-4\cdot\left(2x-1\right)=16\)
\(\Rightarrow-4\cdot\left(2x-1\right)=16-36=-20\)
\(\Rightarrow4\cdot\left(2x-1\right)=20\)
\(\Rightarrow2x-1=20:4=5\)
\(\Rightarrow2x=5+1=6\)
\(\Rightarrow x=6:2\)
\(\Rightarrow x=3\)
3[2x+1]=5+10
3[2x+1]=15
2x+1=15:3
2x+1=5
2x+1=22+1
=>x=2
5x+1=36-10
5x+1=26
5x+1=52+1
=>x=2
2x - 36 = 46 : 43
2x - 36 = 64
2x = 64 + 36
2x = 100
x = 100 : 2
x = 50
5x+ 11= 36
5x = 36 - 11
5x = 25
=> x = 2
k mik nha làm ơn
a)\(2x-36=4^6:4^3\Rightarrow2x-36=4^3\Rightarrow2x-36=64\Rightarrow2x=64+36\Rightarrow2x=100\Rightarrow x=50\)
b)\(5^x+11=36\Rightarrow5^x=36-11\Rightarrow5^x=25\Rightarrow x=2\)
Bài 2:
a) 11. x = -55
x = -55 : 11
x = -5
Vậy x = -5
b) -3 . x = -12
x = -12 : (-3)
x = 4
Vậy x = 4
c) 3x - 12 = -48
3x = -48 + 12
3x = -36
x = -36 : 3
x = -12
Vậy x = -12
d) 10 + 23 . (2x - 10) = -36
23 . (2x - 10) = -36 - 10
23 . (2x - 10) = -46
2x - 10 = -46 : 23
2x - 10 = -2
2x = -2 + 10
2x = 8
x = 8: 2
x = 4
Vậy x = 4
f) | 2x - 1| + 3 = 8
|2x - 1| = 8 - 3
|2x - 1| = 5
\(\Rightarrow\left[\begin{matrix}2x-1=5\\2x-1=-5\end{matrix}\right.\Rightarrow\left[\begin{matrix}2x=6\\2x=-4\end{matrix}\right.\Rightarrow\left[\begin{matrix}x=3\\x=-2\end{matrix}\right.\)
Vậy x = 3 hoặc x = -2
g) |2x2 - 3| - 4 = 11
|2x2- 3| = 11 + 4
|2x2 - 3| = 15
\(\Rightarrow\left[\begin{matrix}2x^2-3=15\\2x^2-3=-15\end{matrix}\right.\Rightarrow\left[\begin{matrix}2x^2=18\\2x^2=-12\end{matrix}\right.\Rightarrow\left[\begin{matrix}x^2=9\\x^2=-6\end{matrix}\right.\Rightarrow\left[\begin{matrix}x^2=3^2\\\left(loại\right)\end{matrix}\right.\Rightarrow\left[\begin{matrix}x=3\\\end{matrix}\right.\)
Vậy x = 3.
Bài 1:
\((-48) . 72 +36 . (-304) \)
\(=\left[\left(-48\right).\left(36.2\right)\right]+36.\left(-340\right)\)
\(=\left[\left(-48\right).2\right].36+36.\left(-340\right)\)
\(=\left(-96\right).36+36.\left(-304\right)\)
\(=36.\left[\left(-96\right)+\left(-304\right)\right]\)
\(=36.\left(-400\right)\)
\(=-14400\)
a) \(6x-36=5^{12}:5^{10}-2012^0\)
\(6x-36=5^2-2012^0\)
\(6x-36=25-1\)
\(6x-36=24\)
\(6x\) \(=24+36\)
\(6x\) \(=60\)
\(x=60:6\)
\(x=10\)
Vậy \(x=10\)
b) \(2x-125=-65\)
\(2x\) \(=\left(-65\right)+125\)
\(2x\) \(=60\)
\(x=60:2\)
\(x=30\)
Vậy \(x=30\)
c) \(2012-120\left(4x+1\right)=932\)
\(120\left(4x+1\right)=2012-932\)
\(120\left(4x+1\right)=1080\)
\(4x+1=1080:120\)
\(4x+1=9\)
\(4x\) \(=9-1\)
\(4x\) \(=8\)
\(x=8:4\)
\(x=2\)
Vậy \(x=2\)
a) 6x - 36 = 512 : 510 - 20120
6x - 36 = 52 - 20120
6x - 36 = 25 - 1
6x - 36 = 24
6x = 24 + 36
6x = 60
x = 60 : 6
x = 10
Vậy x = 10
b) 2x - 125 = -65
2x = (-65) + 125
2x = 60
x = 60 : 2
x = 30
Vậy x = 30
c) 2012 - 120(4x + 1) = 932
120(4x + 1) = 2012 - 932
120(4x + 1) = 1080
4x + 1 = 1080 : 120
4x + 1 = 9
4x = 9 - 1
4x = 8
x = 8 : 4
x = 2
Vậy x = 2.
Chúc bạn học tốt!
7x-3.4=196
7x-3=49
x-3=2
x= -1
2x+3+2x=36
2x.9=36
2x=4
x=2
(52x.5x+2):25=1255
53x+2=517
x=5
a) |x-1|-2x=5
\(\Leftrightarrow\) x - 1 - 2x = 5 (đk: x\(\ge\)1 ) (1)
hoặc -x + 1 - 2x = 5 ( đk: x < 1) (2)
(1): \(\Leftrightarrow\) x - 2x = 5 + 1
\(\Leftrightarrow\) - x = 6
\(\Leftrightarrow\) x = -6 (ko thỏa mãn)
(2): \(\Leftrightarrow\) -x + 1 - 2x = 5
\(\Leftrightarrow\) -3x = 4
\(\Leftrightarrow\) x = \(\frac{-4}{3}\) (thỏa mãn)
Vậy: x = \(\frac{-4}{3}\)
b) |9-7x|=5x-3
\(\Leftrightarrow\) 9 - 7x = 5x - 3 (đk: \(\le\) \(\frac{9}{7}\) ) (1)
hoặc -9 + 7x = 5x - 3 (đk: x > \(\frac{9}{7}\) ) (2)
(1): \(\Leftrightarrow\) -7x-5x = -3-9 \(\Leftrightarrow\) -12x = -12 \(\Leftrightarrow\) x = 1 ( thỏa mãn)
(2): \(\Leftrightarrow\) 7x - 5x = -3 + 9 \(\Leftrightarrow\) 2x = 6 \(\Leftrightarrow\) x = 3 ( thỏa mãn)
Vậy: x= 1; 3
c) 5x+2 = 625
\(\Leftrightarrow\) 5x . 52 = 54
\(\Leftrightarrow\) 5x = \(\frac{5^4}{5^2}\)= 52
\(\Leftrightarrow\) x = 2
d) (2x - 3)2 = 36
\(\Leftrightarrow\) \(\left[{}\begin{matrix}2x-3=6\left(đk:x\ge\frac{3}{2}\right)\text{}\Leftrightarrow x=4,5\left(TMĐK\right)\\2x-3=-6\left(đk:x< \frac{3}{2}\right)\Leftrightarrow x=-1,5\left(TMĐK\right)\end{matrix}\right.\)
Vậy: x = 4,5; -1,5
1 tính nhanh:
(-48)x72+36x(-340)
=(-48)x72+36x2x(-120)
=(-48)x72+72x(-120)
=72x(-48+-120)
=72x(-168)
=-12096
2 tìm x
a)11.x=-55
x=-55:11
x=-5
Vậy x=-5
b)-3.x=-12
x=(-12):(-3)
x=4
Vậy x=4
c)3x-12=48
3x=48+12
3x=60
x=60:3
x=20
Vậy x=20
d)10+23.(2x-10)=-36
23.(2x-10)=-36-10
23.(2x-10)=-46
2x-10=-46:23
2x-10=-2
2x=-2+10
2x=8
x=8:4
x=2
Vậy x=2
f)|2x-1|+3=8
|2x-1|=8-3
|2x-1|=5
Vậy x=5
TH1: 2x-1=5
2x=5+1
2x=6
x=6:2
x=3
TH2:2x-1=-5
2x=-5+1
2x=-4
x=-4:2
x=-2
Vậy x=3 hoặc -2
g)|2x2-3|-4=11
|2x2-3|=11+4
|2x2-3|=15
TH1: 2x2-3=15
2x2=15+3
2x2=18
x2=18:2
x2=9
x=3;-3
TH2:2x2-3=-15
2x2=-15+3
2x2=-12
x2=-12:2
x2=-6
vì x2>0 =>Trường hợp này là vô lý
Vậy x=3 hoặc -3
CHÚC BẠN HỌC GIỎI !
Bằn tùm lum
\(2x+36:12=5^3\)
\(\Rightarrow2x+3=125\)
\(\Rightarrow2x=125-3\)
\(\Rightarrow2x=122\)
\(\Rightarrow x=122:2\)
\(\Rightarrow x=61\)