Viết rõ ra đi bạn.
Trả lời:
5x ( x - 3 )2 - 5 ( x - 1 )3 + 15 ( x + 2 ) ( x - 2 ) = 5
<=> 5x ( x2 - 6x + 9 ) - 5 ( x3 - 3x2 + 3x - 1 ) + 15 ( x2 - 4 ) = 5
<=> 5x3 - 30x2 + 45x - 5x3 + 15x2 - 15x + 5 + 15x2 - 60 = 5
<=> 30x - 55 = 5
<=> 30x = 60
<=> x = 2
Vậy x = 2 là nghiệm của pt.
tìm x ,biết
a, x^2 -4x =12
b, ( 5x+1)^2 - (5x -3)(5x+3)=30
c, (x-1) ( x^2 +x +1 ) + x(x +2) (2-x)=5
d, 5x(x-3)^2 -5 (x-1)^3 +15 (x+4) (x-4) =5
tìm x biết
a) 5x(2x-7)+2x(8-5x)=5
b)(3x-5)(7-5x)-(5x+2)(2-3x)=4
c)5(2x-3)^2-5(x+1)^2-15(x+4)(x-4)=-10
d) 5x(x-3)(x+3)-(2x-3)^2 -5(x+2)^3+34x(x+2)=1
tìm x biết
5x -(x-3)^2 -5(x-1)^3 +15(x-1)(x+2)=5
Tìm x, biết
a) 5x(x-3)^3 - 5(x - 1)^3 + 15(x+2)*(x-2)=5
b)(x+3)^3 - x(3x+1)^2 + (2x + 1)*(4x^2-2x+1)-3x^2= 42
tìm x,biết :
a, ( x + 2 )2 - 9 = 0
b, x2 - 2x + 1 = 25
c, ( 5x + 1 )2 5 (5x -3 ) =30
d, ( x-1 ) (x2 - x + 1 ) - x (x + 2 ) ( 2 - x ) =5
e, 5x (x - 3 )2 - 5 ( x - 1 ) + 15 ( x + 4 ) ( x - 4 ) = 5
Tìm x, biết:
A) (x -1)^3+(2-x)(4+2x+x^2)+3x(x+2)=17
B) (x+2)(x^2-2x+4)-x(x^2-2)=15
C) (5x-2)(5x+2)-(5x+3)(5x-4)=8
D) (4x-3)(4x+2)+(4x+5)(1-4x)=2.5^2
1. TÌm x:
a)4x^2-2x+3-4x.(x-5)=7x-3
b)-3x.(x-5)+5.(x-1)+3x^2=4x
c)7x.(x-2)-5.(x-1)=21x^2-14x^2+3
d)3.(5x-1)-x.(x-2)+x^2-13x=7
e) 1/5x.(10x-15)-2x.(x-5)=12
1. TÌm x:
a)4x^2-2x+3-4x.(x-5)=7x-3
b)-3x.(x-5)+5.(x-1)+3x^2=4x
c)7x.(x-2)-5.(x-1)=21x^2-14x^2+3
d)3.(5x-1)-x.(x-2)+x^2-13x=7
e) 1/5x.(10x-15)-2x.(x-5)=12
Tìm X: 5x(x-3)2-5(x-1)2+15(x+2)(x-2)=5
