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(2+4+6+......+98+100)x=5100
(2+4+6+......+98+100)x =5100
50 số hạng
(2 +100 ) + (4+98) +......+ (50+52) x=5100
( 102 + 102 +.......+ 102 ) x =5100
25 số
102 *25x=5100
x =5100 :2550
x =2
1/Tìm x,biết:
a)x+(x+1)+(x+2)+(x+3)+...+(x+99)+(x+100)=5555
b)1+2+3+4+...+x=820
c)3(x+1)=9.27
d)x+2x+3x+...+99x+100x=15150
e)(x+1)+(x+2)+(x+3)+...+(x+100)=205550
f)3x+3x+1+3x+2=351
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
Tìm x để:
a/ (15-3x) chia hết cho (2x+1)
b/ (6x+9) chia hết cho (4x+1)
c/ (12x + 73) chia hết cho (8x-3)
d/ (6x+8) chia hết cho (4x+3)
e/ (3x+2) chia hết cho (2x+1)
Giúp mình v
Bài10872917292872917 tìm x bt
5x-16=40+x
4x-10=15-x
-12+x=5x-2
7x-4=20+3x
5x-7=20+3x
x+15=7+6x
17-x=7-6x
3x+(-21)=12-8x
125:(3x-13)=25
541+(218-z)=735
3(2x+1)-19=14
175-5(x+3)=85
4x-40=|4|+12
x+15=20-4x
8x+|-3|=-4x+39
6(x-2)+(-2)=20-4x
tìm x biết /x+1/ + 2x^2012 - 3x^2012 -4x^2012+5x^2012 + 6x^2012 -7x^2012 -8x^2012 +...........+2013x^2012=2012
Bài 1: Tìm x : A) 25%x+4x=35-0,75x
B) 3/4.(x-2) - 1/2.(6-2x)=1/6x + 5
C) -1/2.(3x+5) - 2/3.(9-6x)= 3/5.(x-10) - 3
D) (1/4x - 1,5) + (5/6x-3) - (5/8x-0,5)= -4,5
x+2x+3x+3x+4x+5x+6x+7x+8x+9x+10x=-165.tim x
Tìm x biết x+2x+3x+4x+...+100x=5050
tìm số tự nhiên x biết : x+2x+3x+4x+...+100x = 10100
