\(\Rightarrow\left(x+2\right)^2=9\Rightarrow\left[{}\begin{matrix}x+2=3\\x+2=-3\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=1\\x=-5\end{matrix}\right.\)
(x+2)-1=8
=>(x+2)^2=9
=> x+2 =3
=> x=1
Rút gọn 1) (x-2)^2 - (x+1) (x-1)
2)(3x-2) (3x+2)-(3x+1)^2
3)(x-8) (x+8)-(x+3)^2
4) (2x+y)^2 -2(4x^2-y^2)+(2x-y)^2
Bài 2 tìm x
a) (x+3)^2 - (x-2) (x+2)=8
b) (x-5)^2 - 9 =0
Bài 3 so sánh
A=(2+1) (2^2+1) (2^4+1) (2^8+1) và B = 2^16 .
Bài 1 : Nếu :
\(\left(-8+x^2\right)\left(-8+x^2\right)\left(-8+x^2\right)\left(-8+x^2\right)\left(-8+x^2\right)=1\) \(=1\)
Tìm x
I) phan tich
1, 3x^2 - 11x+6
2, 8x^2 + 10x-3
3, 9x^2-9xy-xy
4, x^3+x+2
5, x^8y^8+x^4y^4 + 1
6, x^5+x^4+1
7, x^8+x^2+1
8, x^8+x+1
(x^2+6x+8)(x^2+8x+15)-24=0
(x^2+x-2)(x^2+9x+18)-28=0
(x^2-1)^2-x(x^2-1)-2x^2=0
(x^2+4x+8)^2+3x(x^2+4x+8)+2x^2=0
Tìm x
a) 4(x + 1)2 + (2x + 1)2 - 8(x – 1)(x + 1) - 11=0
b)(x + 3)2 – (x – 4)(x + 8) – 1 = 0
a, 1/x-1 + 2/x^2+x+1 = 3x^2/x^2-1
c, x/2(x-3) + x/2(x+1 ) = 2x/(x+1 )(x-3)
b, 8-x/x-7 - 8 = 1/1-7
Tính nhanh :
3^8 x 5^8 - ( 15^4-1 ) x ( 15^4 + 1 )
( 2+ 1 ) x ( 2^2 + 1 ) x ( 2^4 + 1 ) x ... x ( 2^16 +1 ) +1
a) (2+1)(2^2+1)(2^4+1)(2^8+1)
b) 7(2^3+1)(2^6+1)(2^12+1)(2^24+1)
c)(x^2-x+1)(x^2+x+1)(x^2-1)
Lớp 8 nha mn
a)(x^2 -1)^2-x(x^2-1)-2x^2=0
b)(x^2 + 6x+8)(x^2+8x+15)-24=0
c)(x^2+ x- 2)*(x^2+ 9x+18)-28=0
d)(x^2 +4x+8)^2+3x(x^2+4x+8)+2x^2=0
Tính các biểu thức
3 x (22 + 1) x (24 + 1) x (28 + 1) x...x (264 + 1) + 1
8 x (32 + 1) x (34 + 1) x (38 + 1) x...x (3128 + 1) + 1
12 x (52 + 1) x (54 + 1) x (58 + 1) x (516 + 1)
