a ) x + 5/12 = -2/3
=> x = -2/3 - 5/12
=> x = -8/12 - 5/12
=> x = -13/12
b ) 4/5 + 3/4 : x = 1/2
=> 3/4 : x = 1/2 - 4/5
=> 3/4 : x = 5/10 - 8/10
=> 3/4 : x = -3/10
=> x = 3/4 : -3/10
=> x = -5/2
c ) x/2 + x/3 = 1/4
=> 3x/6 + 2x/6 = 1/4
=> ( 3x + 2x )/6 = 1/4
=> 5x/6 = 1/4
=> 20x/24 = 6/24
=> 20x = 6
=> x = 6 : 20
=> x = 0 , 3
Chúc bạn học giỏi !!!
Tìm x biết:
a) 4*|3x - 1| + |x| - 2*|x-5| + 7*|x-3| = 12
b) |x - 2| + |x - 3| - 2*|x - 2| = 4
c) |x + 5| - |1 - 2x| = x
Tìm x, biết:
a) \(\dfrac{2}{3}\)x - \(\dfrac{1}{2}\)x = \(\left(-\dfrac{7}{12}\right)\) . \(1\dfrac{2}{5}\)
b) \(\left(\dfrac{1}{5}-\dfrac{3}{2}x\right)^2\) = \(\dfrac{9}{4}\)
c) (1,25 - \(\dfrac{4}{5}\)x)3 = -125
Tìm X biết :
a) 3/4-(1/2:x+1/2) = 3/5
b) (4-x).(2x+3) = 0
c) 4/-3=-12/x
d)4x/-3=12/-x
Bài 1 tìm số hữu tỉ x biết
a) x*(-3/7)=4/21
b) (-4/7):x=2/5
c) x+1/12= -3/8
d) 2/15-x=-3/10
e) -x+4/5=1/2
f) 3/4(x+1)-1/2=3/7
g) -3/2-2x+3/4=-2
h) -x+4/5=1/2
Tìm x thuộc Q biết rằng:
a) 11/12 - (2/5 + x) = 2/3
b) 2.x (x - 1/7) = 0
c) 3/4 + 1/4 : x = 2/5
tìm x thuộc Q biết rằng :
a) 11/12 - ( 2/5 + x ) = 2/3
b) 2x ( x - 1/7) =0
c) 3/4 + 1/4 :x =2/5
tìm x biết : x.(x+2/3)-x.(x-3/4)=7/12
b)\(\sqrt{x^2}+1\)=x+2
c)\(\left(2x+1\right)^5\)=\(\left(2x+1\right)^{2019}\)
Bài 1. Tìm \(x\).
a) -5(\(x\)2-3\(x\)+1)+\(x \)(1+5\(x\))=\(x-2\)
b) \(12x\)2\(-4x\)\((3x+5)\)\(=10x-17\)
c) \(-4x(x-5)+7x(x-4)-3x\)2\(=12\)
Bài 2. Tính ( Rút gọn).
a) \((x+5).(x-7)-7x.(x-3)\)
b) \(x.(x\)2\(-x-2)-(x-5).(x+1)\)
c) \((x-5).(x-7)-.(x+4).(x-3)\)
d) \((x-1).(x-2)-(x+5).(x+2)\)
Tìm x biết :
a, 4.(18 - 5x) - 12.(3x - 7) = 15.(2x - 16) - 6(x + 14)
b, 5.(3x + 5) - 4.(2x - 3) = 5x + 3.(2x + 12) + 1
c, 2.(5x - 8) - 3.(4x - 5) = 4.(3x - 4) + 11
d, (3x + 2)(2x + 9) - (x + 2)(6x + 1) = (x + 1) - (x - 6)
e, (8x - 3)(3x + 2) - (4x + 7)(x + 4)= (2x + 1)(5x - 1) - 33
