a: =>2x-2/3-3x+3/2=1/2x
=>-3/2x=-5/6
=>x=5/6:3/2=5/6x2/3=10/18=5/9
b: =>-3x+3/4-1/3x-1/6=x
=>-13/3x=-7/12
=>x=7/12:13/3=7/12x3/13=21/156=7/52
Tìm x biết :a, 2/3 (x-1/4)=1/3(2x-1)
b,1/5*2^x+1/3*2^x+1=1/5*2^7+1/2*2^8
a) Tính A = ( 1 - \(\dfrac{1}{2}\) )( 1 - \(\dfrac{1}{3}\) ) (1-\(\dfrac{1}{4}\) ) ....(1-\(\dfrac{1}{2014}\) ) (1-\(\dfrac{1}{2015}\) ) (1-\(\dfrac{1}{2016}\) )
b)Tìm x biết \(\dfrac{x-2}{12}\) + \(\dfrac{x-2}{20}\) + \(\dfrac{x-2}{30}\)+ \(\dfrac{x-2}{42}\) + \(\dfrac{x-2}{56}\) +\(\dfrac{x-2}{72}\) = \(\dfrac{16}{9}\)
Tìm x biết
1) -2x.(1 - 3x) - 4.(x-2) = 3.(1/2 + 6x2)
2) 1/2 . x (1 - 2/3.x ) - 15.(2/3 + x2)
3) (x-2) . (2/3.x -2) = 2/3 . (x2 - x)
Tìm X biết
a, 2/5nhân x-2/3=-1/2
b, (1/2-x) x 2/3=1/8
c, (2x-3/7) -1/2=3/4
d, 2k+1/3=x-5/2
Tìm x để sau số nguyên: A=2/x B=3/1-x C=5/2x+7 D=x+2/x+1 E=x+4/x-1 G=2(x+3)/2x -1 H=11x -15/x+2 I=9x -1/3x-2 Mình đang cần gấp!!!!!!!
Bài 1: Chứng minh đẳng thức:
a)-2(a-b+c)-3(b-c+a)-4(c-a+b) = -a-(a+b)-(4b+3c)
b)-3[a-(-b+c)]-[-(c-a)+(-b-a)] = 4c-3a-2b
Bài 2: Tìm x:
a)-3(x-2)-5(-x+1) = -(-x+3)
b)x-[1-x+(-x)-(3-x)] = 2[x-2(x-1)]
c)-.3{x-(-x+1)-[-z+(3-x)]} = 5-[-(-x)]
Bài 3: Tìm x,y thuộc Z biết:
xy-y = 3
bài 1 : tính
a) 1/7 : 5/17 - 3/2 . ( 1/6 - 7/12 )
b) 25/77 - ( 1/5 - 7/15 ) : 10/11 : |-3/4|
c) 4/7 + 15/4 - 11/4 + 3/7 - 1/2 + 1/3
bài 2 : tìm x
a) 3/4.x + 1/2 = -3/5
b) x-5/4 = 1/3 - 3/4 .x
c) -2/3 . ( x - 1/4 ) = 1/3 . ( 2x-1)
Bài 1: Tìm x, biết: a) \(1\frac{1}{2}x+\frac{-4}{5}=4\) b) \(\frac{2}{3}x+\frac{-1}{2}x=\frac{-5}{12}\) c) \(\frac{3}{7}x-\frac{2}{3}x=\frac{10}{21}\)
