1. ( x + 1/2 ) ^ 2 = 1/16
( x + 1/2 ) ^ 2 = ( 1 / 4 ) ^ 2
=> x + 1/2 = 1/4
x = -1/4
2. ( x - 1/2 ) ^ 2 = 1/16
( x - 1/2 ) ^ 2 = ( 1/4 ) ^ 2
=> x - 1/2 = 1/4
x = 3/4
1+1/2 x (1+2) + 1/3 x (1+2+3) + ...........+ 1/16 x (1+2+3+......16) = ?
Tìm x biết
( x + 1/2 )^2 -1/16 =0
( 3x + 1/2 )^2 + 25/16 = 0
Ta có: 4x=5y => x/5=y/4=>x2/25=y2/16
ta có:
x2/25=y2/16=x2-y2/25-16=1/9
x^2/25=1/9=>x^2=25/9=>x=5/3
y^2/16=1/9=>y^2=16/9=>y=4/3
tích của chúng bằng:5/3*4/3=20/9
\(\frac{1}{1-x}+\frac{1}{1+x}+\frac{2}{1+x^2}+\frac{4}{1+x^4}+\frac{8}{1+x^8}+\frac{16}{1+x^{16}}\)
tìm x biết (1/1*101+1/2*102+...+1/16*116)*x=1/1*11+1/2*12+...+1/16*26
A, thực hiện phép tính
M=1+1/2(1+2)+1/3(1+2+3)+1/4(1+2+3+4)+...+1/16(1+2+3+4+...+16)
B, tìm x biết
|4x+3|-|x-1|=7
1)x/27=-2/36
2)(x+1/2)^2=1/16
Bài 1: Thực hiện phép tính.
A) 3: ( -1/2 )2 + 1/9 x Căn 36
B) 81 x ( 1/3)3 + 1/3
C) Căn 12 + Căn 27 - Căn 3
D) -32 - ( 1/2)-2 : 2 + (2/3)0 : (3/4)-1
E) 3/4 - ( -1/2 )2
F) 15/16 : (-2 2/3) + 15/16 : ( -1 3/5 )
G) 3/5 + -1/4 + 3/20
H) 3: ( -3/2)2 + 1/9 x căn 36
I) 272 x 85/ 66 x 323
J) (0.8)5/ (0.4)6
K) 272/ 242
L) (0.125)3 x 83
M) (-39)4 : 134
N) (0.6)5/ (0.2)6
O) ( 3/7 + 1/2 )2
P) 2:(1/2 - 2/3 )2
Q) 9x (-1/3)3 + 1/3
