tìm x biết
a,2x +20=80-60
b,100x=1000/10
c,250x+250=1750
Tìm số tự nhiên x,y biết:
a, x+2x+3x+...+100x = 15150
b, 2x +80 = 3y
a) x + 2x + 3x + ... + 100x = 15150
=> x(1 + 2 + 3 + ... + 100) = 15150
=> \(x\left(\frac{100\left(100+1\right)}{2}\right)=15150\)
=> x . 5050 = 15150
=> x = 15150 : 5050
=> x = 3
Tìm x biết : 100x-100=1000
100x-100=1000
100(x-1)=1000
x-1=10
x=11
ai click mik mik click lại
100x-100=1000
100x=1000+100
100x=1100
x=1100:100
x=11
100x-100=1000
100x= 1000+100
100x= 1100
x= 1100:100
x=11
Tìm giá trị nhỏ nhất của biểu thức
C = 2x^2 -4x + 2012
D = x^2 + 100x - 1000
1) Tìm x biết :
a) ( 2x - 3/1/2 ) + 250% = 6,2
b) ( 25% - 4/1/2x ) - 2/1/2 . 4^2 = 5,25
c) ( 2x - 1 )^2 - 80 = 1
d) ( x - 1/2 ) . ( 2x + 3 ) > 0
BÀI 1:Tìm x biết
a :3x -5 =x
b: 1.2.3.4.5......(x+1)=0
c:x+ 2x +3x +4x +5x+..............+100x=0
d:x +2x+3x+4x+5x+..................+100x=5050
e:(x+1)+(x+2) +(x+3) +(x+4)+............+(x+100)= 5050
c) x.(1+2+3+4+...+100)=0
x.5050=0
x=0:5050=0
Vậy x=0
d) x.(1+2+3+4+5+...+100)=5050
x.5050=5050
x=1
Vậy x=1
e) x+1+x+2+x+3+x+4+...+x+100=5050
(x+x+x+x+...+x)+(1+2+3+4+...+100)=5050
100 số hạng x
x.100+5050=5050
x.100=0
x=0
Vậy x=0
Tìm x biết x+2x+3x+....+100x=-213
x+2x+3x+....+100x=-213
(1+2+3+...+100)x=-213
(\(\frac{100.\left(100+1\right)}{2}\))x=-213
5050.x=-213
x=-213:5050
x=-0,042 178 217
Tìm x biết |x|+|2x|+|3x|+...+|100x|=5050
a) 2x+48=60
b)3.(x+5)+8=80
c)2x+3x=50
d)x+2x+3x+.........+99x+100x=10100
e)x.(x+2)=0
a . 2x + 48 = 60
2x = 60 - 48 = 12
x=12:2=6
b/3.(x+5)+8=80
3.(x+5)=80-8=72
x+5=72:3
x+5=24
x=24-5=19
c/2x+3x=50
x . ( 2 + 3 ) = 50
x.5=50
x=50:5=10
d/ x +2x+3x+.....+99x+100x=10100
lười suy nghĩ lắm
e/x.(x+2)=0
x=0 bởi vì 0 nhân với số 2 = 0
a) 2x+48=60
=>2x=60-48
=>2x=12
=>x=12:2
x=6
\(a,2x+48=60\)
\(2x=60-48\)
\(2x=12\)
\(x=6\)
\(b,3.\left(x+5\right)+8=80\)
\(3x+15+8=80\)
\(3x+23=80\)
\(3x=80-23\)
\(3x=57\)
\(x=19\)
\(c,2x+3x=50\)
\(x.\left(2+3\right)=50\)
\(5x=50\)
\(x=10\)
Tìm x biết x+2x+3x+4x+...+100x=5050