(+) Với -3/4 <(=) x TA có
-3x - 4 = 9 -2x
-x = 13
x = - 13(TM)
(+) -3/4 < x <(=) 9/2 ta có:
3x + 4 = 9 - 2x
5x = 5
x = 1 ( TM)
(+) Với x >= 9/2 ta có:
3x + 4 = 2x - 9
x = - 13 ( Loại vì -13< 9/2 mà x > 9/2)
Vậy x = -13 ; x = 1
Tìm x:
a) 3x.(1 - 2x) + 6x^2 - 7x = 8.(1 - 2x) - 9
b) 2x.(1 + 3x) - 3x.(4 +2x) = 3x - 4
bai 2 quy tac chuyen ve doi dau
a, 3x ²+6x+9-2x^5: 2x^4+3x:2x
b,4x ²y ²+y ³-2x-y ³+5x-3x ²y ³
c,18x+26x ² -48x ²+1x ³-5x ²-17x-x^4.x ²-4x^6
d,y ²-109y+27y+18y ²-7y ²+52y+9+4y ³-3y ².y ³+15y
/ 3x+4/ = 2x/ 2x - 9/
a, 2x( 3x + 1 ) + 3x ( 4 - 2x ) = 7
b, 4(18 - 5x ) - 12( 3x - 7 ) = 15(2x - 16 ) - 6(x + 14 )
c, ( 3x + 2 ) ( 2x + 9 ) - ( x + 2 ) ( 6x + 1 ) = ( x + 1 ) - ( x - 6 )
Tìm x
Thực hiện phép chia:
a) \((3x^5-9x^6+12x^9):3x\)
b) \((6x^4+4x^3+8x^2):(2x)\)
c) \((8x^6+16x^5-10x^4):(2x^4)\)
d) \((4x^4+6x^5+14x^7):(2x^3)\)
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
Bài 9: Tìm x biết:
d) (2x - 1) . (3x + 1) + (3x + 4) . (3 - 2x) = 5
e) 0,6x (x - 0,5) - 0,3x (2x + 1,3) = 0,38
f) (c - 3x2)(x + 6) + x(3x2 + 17x) = 24
|3x+4|= 2|2x-9|
|3x+4| =2| 2x-9|
