x + x + x + x - x - x = 1900
2x = 1900
x = 1900 : 2
x = 950
(x+x+x+x)-(x+x)=1900
4x-2x=1900
2x=1900
x=950
x + x + x + x - x - x = 1900
2x = 1900
x = 1900 : 2
x = 950
Vậy x = 950
x+x+x+x-x-x=1900
<=>2x=1900
<=>x=1900:2
<=>x=950
Tìm y biết: 248 x 145 + 1900:100 = 1900:100 + 248xy
A. y = 19
B. y = 141
C. y = 145
D. y = 248
X x 4 + X x 6 = 1900
A, X x 12 + X x 18 - X x 20 = 1560 b, X x 126 – X x 23 – X x3 = 1900
1. Tìm X, biết: x - \(\dfrac{2}{3}\) x ( X + 9 ) = 1
2. Tìm X, biết: X - \(\dfrac{11}{15}\) = \(\dfrac{3+X}{5}\)
Tìm X biết:
x x 2 + x x 3 + x x 4 + x = 2130
tìm x biết : X x 2 + X x 3 + X x 4 + X = 2130
tìm x biết : X x 3 + X x 5+ X x 7+.... + X x 101
Tìm x biết: ( x x 1 ) + ( x x 2 ) + ( x x 3 ) +.....+ ( x x 9 ) = 405
Tìm x biết x x 3 + x x 5 + x x 7 +......+ x x 100 = 31200
