3(2x+5) - 2(5 - 4x) = 7
=> 6x + 15 - 10 + 8x = 7
=> 14x + 5 = 7
14x = 7 - 5 = 2
x = 2 : 14
x = 1/7
3(2x+5)-2(5-4x)=7
=> 6x+15-10+8x=7
=> 14x+5=7
=> 14x=7-5
=> 14x=2
=> x=2:14
=> x=2/14=1/7
tìm x
1,(2x+3)^2+(2x+1)(2x-1)=22
2,(4x+3)(4x-3)=46+(4x-5)^2
3,(2x-1)^3-4x^2(2x-3)=5
4,(x+4)^2-(x-1)(x+1)=16
5,(2x-1)^2+(x+3)^2=5(x+7)(x-7)+325
6,(x^2+1)^2-(x^4+x^2+1)(x^2-1)=0
BT1: cho -3x(x+5)=-3x2-15x
(x+3)(x+2)=x2+5x+6
Tìm x biết:
--3x(x+5)+(x+3)(x+2)=7
BT2:Cho(2x+1)2=4x2+4x+1
(2x+1)(2x-1)=4x2-1
Tìm x biết:
(2x+1)2-(2x+1)(2x-1)=19
BT3: Tìm x biết:
a)x(x+1)-x(x+5)=9
b)4x2(x+5)-8x(x+7)=13
Tìm x:
a) (3x+2).(x-1)-(x+2).(3x+1)=7
b) (6x+5).(2x+3)-(4x+3).(3x-2)=8
c) 2x.(x+3)-(x+1).(2x+1)-5=9
d) (5x+3).(4x-7)-(10x+9).(2x-3)=10
Tìm x biết
1,(2x+5)(2x-7)-(-4x-3)^2=16
2,(8x-3)(3x+2)-(4x+7)(x+4)=(2x+1)-(5x-1)
Tìm x:
a)2x(x2-2x+1 )-2x3= -2x(2x-3)+7
b)4x(x-2)-x(4x+5)=3-2x
c)2x(x-3)-x(x+5)=3x-9x3
Bài 1: Tìm x: (2x-6)^3 + (5-x)^3 + (1-x)^3 = 0 Bài 2: Tìm GTNN : A= x^2 -2x -4 B= x^2 -x +5 C= 4x^2 +2x -9 D= 2x^2 -4x +7
Tìm x,biết:
a)4x.(x-5)-(x-1).(4x-3)=23
b)(x+2)2+(2x-3)2=5x.(x+7)
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
Bài 1: Tìm x: (2x-6)^3 + (5-x)^3 + (1-x)^3 = 0
Bài 2: Tìm GTNN :
A= x^2 -2x -4
B= x^2 -x +5
C= 4x^2 +2x -9
D= 2x^2 -4x +7
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