( 3x - 2 )( 9x2 + 6x + 4 ) - ( 2x - 5 )( 2x + 5 ) = ( 3x - 1 )3 - ( 2x + 3 )2 + 9x( 3x - 1 )
⇔ 27x3 - 8 - ( 4x2 - 25 ) = 27x3 - 27x2 + 9x - 1 - ( 4x2 + 12x + 9 ) + 27x2 - 9x
⇔ 27x3 - 8 - 4x2 + 25 = 27x3 - 1 - 4x2 - 12x - 9
⇔ 27x3 - 4x2 + 17 - 27x3 + 4x2 + 12x + 10 = 0
⇔ 12x + 27 = 0
⇔ 12x = -27
⇔ x = -27/12 = -9/4
tìm x
1) (3x-2)(9x^2+6x+4)-(2x-5)(2x+5)=(3x-1)^3-(2x+3)^2+9x(3x-1)
2) (2x+1)^3-(3x+2)^2=(2x-5)(4x^2+10x+25)+6x(2x+1)-9x^2
. Tìm x, biết:
a) 6x.(x – 5) + 3x.(7 – 2x) = 18 b) 2x.(3x + 1) + (4 – 2x).3x = 7 c) 0,5x.(0,4 – 4x) + (2x + 5).x = -6,5 | d) (x + 3)(x + 2) – (x - 2)(x + 5) = 6 e) 3(2x - 1)(3x - 1) – (2x - 3)(9x - 1) = 0 |
tìm x,y
a) ( 3x-2)^3 - (3x - 2) ( 9x^2 + 6x +4) = 6( 3x+5)(5 - 3x )
b) ( 2x - 1)( 4x^2 - 4x +1) - (2x+ 1)^3+ 3(2x+5)(2x - 5)= -5
Tìm x
a.(x+2).(x+3)-(x-2).(x+5) = 0
b. (2x+3).(x-4)+(x-5)(x+2) = (3x-5)(x-4)
c. (3x+2)(2x+9)-(x+2)(6x+1) = x+1-(x-6)
d. 3( 2x-1).(3x-1)-(2x-3).(9x-1)=0
Thu gọn biểu thức
(6x+1)(2x-5)
(2x+5)2-2x(2x+8)
(3x-5)(2x-1)-(2x+3)(3x+7)+30x
(X-1)2-(x+1)(x-1)
(3x+2)(9x2-6x+4)-(3+x)(x-3)
tìm x
a) (x+2)(x+3)-(x-2)(x+5)=6
b) (3x+2)(2x+9)-(x+2)(6x+1)=(x+1)-(x-6)
c) 3(2x-1)(3x-1)-(2x-3)(9x-1)=0
Tìm x :
a) 3(2x-1)(3x-1)-(2x-3)(9x-1)=-3
b) (3x-1)(2x-7)-(x+1)(6x-5)=x+2-(x-5)
tìm x biết
a) (6x-3) (2x+4) + (4x-1) (5-3x) = -21
b) 6x (3x+5) - 2x (9x-2) + (17-x) (x-1) + x (x-18) =0
c) (15-2x) (4x+1) - (13-4x) (2x-3) - (x-1) (x+2) + x2=52
d) (8x-3) (3x+2) - (4x+7) (x+4) = (2x+1) (5x-1) - 33
tìm x:
a) 3x(2x+3)-(2x+5)(3x-2)=8
b) 4x(x-1)-3(x^2-5)-x^2=(x-3)-(x+4)
c) 2(3x-1)(3x-1)-(2x-3)(9x-1)-3=3
d) (3x-1)(2x+7)-(x+1)(6x-5)=(x+2)-(x-5)
giúp mk nhé mk có 5 tài khoản mk sẽ tick hết cho
