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a) 6x = 19 + 15 = 34
=> x = 34 : 6 = 17/3
b) 3x + 2 = 8
=> 3x = 8 - 2 = 6
=> x = 6 : 3 = 2
c) 12x - 33 = 135
=> 12x = 135 + 33 = 168
=> x = 168 : 12 = 14
d) 100x + \(\frac{100.101}{2}\) = 5750
<=> 100x + 5050 = 5750
=> 100x = 5750 - 5050 = 700
=> x = 700 : 100 = 7
Bài 2:Tìm x
a.6x-15=19 b. 3x+2=20+(-12)
6x=19+15 3x+2=8
6x=34 3x=6
x=34:6 x=6:3
x=17/3 x=2
Vậy x=17/3 Vậy x=2
c) 12x - 33=5.3^3 d) ( x+1 ) + ( x+2 ) + ... + ( x+100 ) = 5750
12x-33=135 Vì cứ 1 số hạng lại có 1x
12x=135-33 Vậy từ 1 đến 100 có số số hạng là:
12x=102 (100-1):1+1=100(số)
x=102:12 Tổng dãy số là:
x=17/2 (100+1)x100:2=5050
Vậy x=17/2 Do đó có 100x ta có:
( x+1 ) + ( x+2 ) + ... + ( x+100 ) = 5750
(x+x+...+x)+(1+2+...+100)=5750
100x+5050=5750
100x=700
x=7
Vậy x=7
a)6x-15=19
6x=19+15
6x=34
x=34/6
b)3x+2=20+(-12)
3x+2=8
3x=8-2
3x=6
x=6/3
x=2
c)12x-33=5*33=5*27=135
12x=135+33
12x=168
x=168/12
x=14
d)(x+1)+(x+2)+...+(x+100)=5750
(x+x+....+x)+(1+2+3+....+100)=5750
100x+5050=5750
100x=5750-5050
100x=700
x=700/100
x=7
a) (2x + 1)3 = 125
2x + 1 = 5
2x = 4
x = 2
b) x15 = x
x = 0 hoặc x = 1 hoặc x = - 1
c) (x - 5)4 = (x - 5)6
x - 5 = 0 hoặc x - 5 = 1 hoặc x - 5 = - 1
x = 5 hoặc x = 6 hoặc x = 4
d) (x + 1) + (x + 2) + (x + 3) + ... + (x + 100) = 5750
100x + 1 + 2 + 3 + ... + 100 = 5750
100x + 5050 = 5750
100x = 700
x = 7
a: =>x/27+1=-2/3
=>x/27=-5/3
=>x=-45
b: \(\Leftrightarrow x-4=\dfrac{2}{5}:\dfrac{20}{21}=\dfrac{2}{5}\cdot\dfrac{21}{20}=\dfrac{42}{100}=\dfrac{21}{50}\)
=>x=221/50
c: \(\Leftrightarrow x+\dfrac{2}{3}=\dfrac{4}{60}=\dfrac{1}{15}\)
=>x=1/15-2/3=1/15-10/15=-9/15=-3/5
d: \(\Leftrightarrow x\cdot\dfrac{3}{5}=\dfrac{1}{5}-\dfrac{15}{14}\cdot\dfrac{21}{20}\)
=>\(x\cdot\dfrac{3}{5}=\dfrac{1}{5}-\dfrac{3}{2}\cdot\dfrac{3}{4}=\dfrac{1}{5}-\dfrac{9}{8}=\dfrac{-37}{40}\)
=>x=-37/24
e: =>-3/7x=84/45
=>x=-196/45
f: =>11/10x=-2/3
=>x=-20/33
a) \(???\)
b) \(123x+877x=2000\)
\(1000x=2000\)
\(x=2000:1000\)
\(x=2\)
c) \(2x.\left(x-10\right)=0\)
=> \(x-10=0\)
\(x=10\)
d)\(6.\left(x+2\right)-\left(4x+10\right)=100\)
\(6.x+12-4x+10=100\)
\(2x+2=100\)
\(2x=98\)
\(x=98:2\)
\(x=49\)
e) \(x.\left(x+1\right)=2+4+6+8+...+2500\)
\(x.\left(x+1\right)=1563750\)
mà ta thấy : \(1250.1251=1563750\)
=> \(x=1250\)
g)\(\left(x+1\right)+\left(x+2\right)+...+\left(x+100\right)=5750\)
\(x.100+5050=5750\)
\(x.100=5750-5050\)
\(x.100=700\)
\(x=7\)
a) (2x - 3)(6 - 2x) = 0
=> \(\left[{}\begin{matrix}2x-3=0\\6-2x=0\end{matrix}\right.=>\left[{}\begin{matrix}2x=3\\2x=6\end{matrix}\right.=>\left[{}\begin{matrix}x=\dfrac{3}{2}\\x=3\end{matrix}\right.\)
b) \(5\dfrac{4}{7}:x=13=>\dfrac{39}{7}:x=13=>x=\dfrac{39}{7}:13=>x=\dfrac{3}{7}\)
c) \(2x-\dfrac{3}{7}=6\dfrac{2}{7}=>2x-\dfrac{3}{7}=\dfrac{44}{7}=>2x=\dfrac{47}{7}=>x=\dfrac{47}{14}\)
d) \(\dfrac{x}{5}+\dfrac{1}{2}=\dfrac{6}{10}=>\dfrac{x}{5}=\dfrac{6}{10}-\dfrac{1}{2}=>\dfrac{x}{5}=\dfrac{1}{10}=>x.10=5=>x=\dfrac{1}{2}\)
e) \(\dfrac{x+3}{15}=\dfrac{1}{3}=>\left(x+3\right).3=15=>x+3=5=>x=2\)
a) 2x - 15= 52.3
2x - 15= 25.3
2x - 15 = 75
2x = 75 + 15
2x = 90
x = 90 : 2
x = 45
b) 3x+1 - 12 = 3.23
3x+1 - 12 = 69
3x+1 = 69 + 12
3x+1 = 81
=> 3x+1 = 34
=> x + 1 = 4
=> x = 4 - 1
=> x = 3
c) mk ko hiểu đề lắm =\