(2x+7)^2-36=0
(2x+7)^2=0+36=36
(2x+7)^2=6^2
nên 2x+7=6
2x=6-7=-1
nên x=-1/2
(2x+7)^2-36=0
(2x+7)^2=0+36=36
(2x+7)^2=6^2
nên 2x+7=6
2x=6-7=-1
nên x=-1/2
Tìm x:
2x(x-1/7)=0 (x-3/4).2/5=-2
3/4+1/4:x=0. 2/3x+-1/2x+x=-5/36
(x+2)(x-3)<0. (x+1)(x-3)>0
tìm X
1)\(\left(\frac{2x}{3}-3\right):\left(-10\right)=\frac{2}{5}\)
2)\(|2x-1|+1=4\)
3)\(\left(3x-7\right)^2=36\)
4)\(2^2.8^{x-1}=32\)
5) 7(x-2) + 2x(2-x)=0
tìm x biết
x.(2x+7)=0
x.(2x+7)>0
x.(2x+7)<0
bài 1: tính
a) -6x+3(7+2x)
b)15y-5(6x+3y)
c) x(2x+1)-x2(x+2)+(x3-x+3)
d)4(x-6)-x2(2+3x)+x(5x-4)3x2(x-1)
bài 2: tìm x
a)3x+2(5-x)=0
b)3x2-3x(-2+x)=36
c)5x(12x+7)-3x(20x-5)=-100
- Tìm x :
a) 3(2x+8) - (5x+2)=0
b) 5(7-3x) + 7(2+2x) = 0
Tìm X ,biết :
a, (3/4)^x = 28/34
b, (x+2)^2 = 36
c, ( x - 2)^8 = ( x - 2)^6
d, [ 1/2.x^2.(2x-1)^m - 1/2.x^m+2]: 1/2.x^2=0 ( m thuộc N )
e, ( 2x - 1)^2k + (y-1/3)^2k=0 (k thuộc N)
Tìm X ,biết :
a, (3/4)^x = 28/34
b, (x+2)^2 = 36
c, ( x - 2)^8 = ( x - 2)^6
d, [ 1/2.x^2.(2x-1)^m - 1/2.x^m+2]: 1/2.x^2=0 ( m thuộc N )
e, ( 2x - 1)^2k + (y-1/3)^2k=0 (k thuộc N)
tìm x : a, x-2/5).(x+2/7)>0 b,(2x-1/2).(3x-1/3)<0
tìm x biết:
a) 2x = 4y-1
b) ( 2x - 1 ) + | 2y - x | - 8 = 12 - 5.22
c) 5x x (53)2 = 625
d) ( 5x + 1 )2 = \(\frac{36}{49}\)
e) tìm x, y biết: | x - 2011y | + | y - 1 | = 0
f) tìm x \(\in\)Z biết: ( x - 7 )x + 1 - ( x - 7 )x + 11 = 0