a,\(\left(x+4\right)^2\) - (x+1)(x-1) =16
\(\left(x+4\right)^2\) - \(\left(x+1\right)^2\) =16
(x+4-x+1)(x+4+x+1)=16
5(2x+5)=16
ma 5\(\ne\) 16
\(\Rightarrow\) 2x+5=16
2x = 11
x=5,5
Tìm x biết
a,25x mũ 2 - 9=0
b,(x + 4)mũ 2 - (x+1)(x-1)=16
c,(2x-1)mũ 2+(x+3)mũ 2 - 5(x+7)(x-7)=0
Tìm x biết
a,(x+4)^2-(x+1)(x-1)=16
b,(2x-1)^2-(x+3)-5(x-7)(x+7)=0
c,3(x-1)^2-3x(x-5)=1
d,6(x-2)^2+(5x-2)^2-4(3x-1)(5x-2)=0
e,(x-2)^3-x^2(x-6)=4
g,(x-1)(x^2+x+1)-x(x+2)(x-2)=5
h,(x-1)^3-(x+3)(x^2-3x+9)+3(x^2-4)=2
a)(2x-1)^2+(x+3)^2-5(x+7)(x-7)=0
b)(x+2)(x^2-2x+4)-x(x^2+2)=15
c)(x+3)^3-x(3x+1)^2+(2x-1)(4x^2-2x+1)=28
d)(x^2-1)^3-(x^4+x^2+1)(x^2-1)=0
A, (x-2)^2=4x^2+4x+1 B, 25x^2-9=0 C, (2x-1)^2+(x+3)^2-5(x+7)(x-7)=0 D, (2x+1)(x-4)-2(x-3)^2=8 E, (3x-1)^2=(5-x)^2
1, tìm x :
a) (x+2).(x+3)-(x-2).(x+5)=0
b) (2x+3).(x-4)+(x-5).(x-2)=(x-4).(3x-5)
c) (3x-5).(7-5x)-(5x+2).(2-3x)=3
d)(x-7).(x+7)-(x-4)2-x=10+3
e) (x+1/2)2-(x-1).(x+1)=2x-1
2, Thu gọn :
a) (x+5)2-(3-x)2-2(x-4).(x+4)
b)4(x-1)2+(2x+3)2-8(x-2)(x+2)
a)(2x-1)^2+(x+3)^2-5(x+7)(x-7)=0
b)(x+3)^3-x(3x+1)^2+(2x-1)(4x^2-2x+1)=28
c)(x+2)(x^2-2x+4)-x(x^2+2)=15
d)(x^2-1)^3-x^4+x^2+1)(x^2-1)=0
Bài 1:
a, (x+1)^2-(x-1)^2-3(x+1)(x-1)
b, 5(x+2)(x-2)-1/2(6-8x)^2+17
Bài 2: Tìm x
a, 25x2-9=0
b, (x+4)-(x+1)(x-1)=16
c, (2x-1)2 +(x+3)2-5(x+7)(x-7)=0
Bài 3: Tìm GTNN
A= x2+5X=7
Bài 4 : Tìm GTLN
B= 6x -x2-5
Bài 5:Cho x-y=-5. Tính giá trị của N=(x-y)3-x2+2xy-y2
1, tìm x :
a) (x+2).(x+3)-(x-2).(x+5)=0
b) (2x+3).(x-4)+(x-5).(x-2)=(x-4).(3x-5)
c) (3x-5).(7-5x)-(5x+2).(2-3x)=3
d)(x-7).(x+7)-(x-4)2-x=10+3
e) (x+1/2)2-(x-1).(x+1)=2x-1
2, Thu gọn :
a) (x+5)2-(3-x)2-2(x-4).(x+4)
b)4(x-1)2+(2x+3)2-8(x-2)(x+2)
NHỮNG HẰNG ĐẲNG THỨC ĐÁNG NHỚ
- Bài 1 : Tìm x biết
a. 25x2 - 9 = 0
b. ( x + 4 )2 - ( x+1 ).(x-1) = 16
c. (2x-1)2 + (x+3)2 - 5.(x+7).(x-7) = 0
______ GIÚP MÌNH NHA MÌNH CẦN GẤP_______
