a) \(x-\frac{3}{4}=2x+\frac{1}{2}\)
\(x-2x=\frac{1}{2}+\frac{3}{4}\)
\(-x=\frac{5}{4}\)
\(x=-\frac{5}{4}\)
câu b:
3x - 6 - 2x -6 = 4
3x - 2x -12 = 4
x - 12 = 4
x = 16
tìm x , biết
a) 5/6 - x = -7 / 12 + 2/3
b) ( 2,4x - 36 ) : 1va5/7 = -1
c) 2 ( x - 1 ) - 3 ( 2x + 2 ) - 4 ( 2x + 3 ) = 16
d ) ( x - 2 ) . ( x + 3 ) > 0
1. Tìm x , biết :
a, x-3 + (5+3) = 3-(6-4)
b, 3-(x-6)+(2x-4)=11
c, 17-(2-x)-(3-x-17)=6
2. Rút gọn phép tính :
a, a-(b-c)+(a-c+b)-b
b, 2x -(5-x+a)+(x-5-a)
a, \(\dfrac{5}{2}-3\left(\dfrac{1}{3}-x\right)=\dfrac{1}{4}-7x\)
b,\(60\%.x+\dfrac{2}{3}.x=\dfrac{1}{3}.6\dfrac{1}{3}\)
c, \(\left(\dfrac{9}{2}.x-2x\right).\left(-1\dfrac{4}{7}\right)=\dfrac{11}{4}\)
d,\(\left(x+\dfrac{5}{6}\right).2\dfrac{2}{5}-1\dfrac{1}{4}=35\%\)
Bài 1: Tìm x, biết:
a, 2/1/4x - 9/1/4 = |-20|
b, 1/2x + 2/3. ( x-2) =1/3
c, x- 25% = 6/11. (1/2+ 3/4 - 1/3)
d, - (-23) + (-36) - |-57| + (-29) .2
e, x/30 = 3/10 + -1/15
f, (x - 1/4) : 4/5 = 15/16
g, 1/3/5- 7/12 :x - -9/4
h, (2/4/5. x +50 ). 2/3 = -51
b) 1500.(x – 7) = 0
c) (2.x – 4).(48 – 12.x) = 0
d) (x + 12).(x – 1) =0
Bài 2: Tìm x biết:
a) 128- 3(x+ 4) = 23
b) [(14x+ 26). 3+ 55]: 5= 35
d) 720: [41- (2x- 5)]= 23. 5
Đề bài: Tìm x, biết:
a) 390 - ( x - 7) = 13 mũ 2 : 12
b) ( x - 35 . 2 mũ 2) : 7= 3 mũ 3 - 24
c) x - 6 : 2 - ( 4 mũ 2 . 3 - 24) : 2 : 6 = 3
d) 4 . x - 5 = 5 + 5 mũ 2 +5 mũ 3 + ..... + 5 mũ 99
e) ( 2 . x - 1 ) mũ 4 = 625
Tìm x biết :
a) (x+1)(3-x) > 0
b) (2x-3)+4-x) <0
c) (x + 1/3 )(2/3 - 2x) = 0
a) 3/4-2.|2x-2/3|=2
b) -5.(x+1/5)-1/2.(x-2/3)=3/2x-5/6
Tìm x biết
a) x +(x + 1) + (x + 2) + .... + (x +30) = 620
b) 2+4+6+8+....+2x = 210
c) (x-1) +(x-2)+(x-3)+...+(x-20) = -610
d) (x-3)(2x-7) = 0
e) |3-x| = x-5
g) |5x-2| \(^{_{ }\le}\)13
h) x+|2-x|=6
t) \(3^x+3^{x+1}+3^{x+2}=1053\)
i) | x+1| +|x-2| = 3
Nhanh lên! Mình cần gấp. Nguyễn Huy Tú