Tìm x
a, 5.x+73.21=73.26
b,128-3(x+4)=23
c, (x+1)+(x+3)+(x+3)+....+(x+100)=5750
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(x+1)+(x+2)+(x+3)+...+(x+100)=5750
x + 1 + x + 2 + x + 3 + .... + x + 100 = 5750
(x + x + x + ... + x) + (1 + 2 + 3 + ... + 100) = 5750
100x + 5050 = 5750
100x = 5750 - 5050 = 700
x = 700 : 100 = 7
x + 1 + x + 2 + .. + x + 100 = 5750
=> ( x+ x + ... + x ) + ( 1 + 2 + .. + 100 )) = 5750
=> 100x + 5050 = 5750
=> 100x = 5750 - 5050
=> 100x = 700
=> 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
\(\left(x+1\right)+\left(x+2\right)+\left(x+3\right)+...+\left(x+100\right)=5750\)
\(\left(x+x+x+...+x\right)+\left(1+2+3+...+100\right)=5750\)
\(\Rightarrow100x+5050=5750\Rightarrow x=5750-5050\)
\(100x=700\Rightarrow x=700:100=7\)
A. \(\left(x+1\right)+\left(x+2\right)+......+\left(x+100\right)=5750\)
\(x+1+x+2+....+x+100=5750\)
\(100x+\left(1+2+3+.......+100\right)=5750\)
\(100x+5050=5750\)
\(100x=700\)
\(x=700:100=7\)
B. x+(1+2+......+100) = 2000
x + 5050 = 2000
x = 2000 - 5050
x= -3050
C. ( x-1 )+(x-2)+......+( x - 100 ) = 50
x-1+x-2+.........+x-100 = 50
100x + ( -1-2-........-100 ) = 50
100x + ( - 5050 ) = 50
100x = 50 + 5050
100 x = 5100
x = 5100 : 100
x = 51
A . \(\left(x+1\right)+\left(x+2\right)+\left(x+3\right)+...+\left(x+100\right)=5750\)
\(\left(x+x+x+...+x\right)+\left(1+2+3+...+100\right)=5750\)
\(100x+5050=5750\)
\(100x=5750-5050\)
\(100x=700\)
\(\Rightarrow x=\frac{700}{100}=7\)
B. \(x+\left(1+2+3+4+5+....+100\right)=2000\)
\(x+\frac{\left(100+1\right).100}{2}=2000\)
\(x+5050=2000\)
\(\Rightarrow x=2000-5050=-3050\)
C. \(\left(x-1\right)+\left(x-2\right)+\left(x-3\right)+....+\left(x-100\right)=50\)
\(\left(x+x+x+...+x\right)-\left(1+2+3+...+100\right)=50\)
\(100x-5050=50\)
\(100x=5100\)
\(\Rightarrow x=\frac{5100}{100}=51\)
a)720:[41-(2x-5)]=40
41-(2x-5)=720:40
41-(2x-5)=18
2x-5=41-18
2x-5=23
2x=28
x=14
a: =>41-(2x-5)=720:40=18
=>2x-5=23
=>2x=28
=>x=14
b: =>100x+5050=5750
=>100x=700
=>x=7
a: =>41-(2x-5)=720:40=18
=>2x-5=23
=>2x=28
=>x=14
b: =>100x+5050=5750
=>100x=700
=>x=7
a)5. x +73.21=73.26
5. x +1533=1898
5.x =1898-1533
5. x =365
x =365:5
x =73
b)128-3.(x+4)=23
3.(x+4)=128-23
3.(x+4)=105
x+4=105:3
x+4=35
x =35-4
x =31
c)(x+1)+(x+3)+(x+4)+.....+(x+100)=5750
suy ra (x+x+x+......+x)+(1+2+3+...+100)
suy ra 100.x + 5050=575 0
suy ra 100. x =5750-5050
suy ra 100. x =700
x =700:100
x =7
Bạn tham khảo bài mình nhé .
a) 5 . x + 73 . 21 = 73 . 26
5 . x + 1533 = 1898
5 . x = 1898 - 1533
5 . x = 365
x = 365 : 5
x = 73
Vậy x = 73
b) 128 - 3 ( x + 4 ) = 23
3 ( x + 4 ) = 128 - 23
3 ( x + 4 ) = 105
x + 4 = 105 : 3
x + 4 = 35
x = 35 - 4
x = 31
Vậy x = 31
c) ( x + 1 ) + ( x + 3 ) + ( x + 3 ) + ... + ( x + 100 ) = 5750
\(\Rightarrow\) ( x + x + x + ... + x ) + ( 1 + 2 + 3 + ... + 100 )
\(\Rightarrow\) 100 . x + 5050 = 5750
\(\Rightarrow\) 100 . x = 5750 - 5050
\(\Rightarrow\)100 . x = 700
x = 700 : 100
x = 7
Vậy x = 7 .