\(A=\dfrac{1}{2}-\dfrac{1}{4}-\dfrac{1}{8}-...-\dfrac{1}{1024}\)
Đặt \(B=\dfrac{1}{4}+\dfrac{1}{8}+...+\dfrac{1}{1024}\)
=>2B=1/2+1/4+...+1/512
=>B=1/2-1/1024
A=1/2-1/2+1/2024=1/1024
\(\dfrac{1}{x-1}-\dfrac{1}{x+1}-\dfrac{2}{x^2+1}-\dfrac{4}{x^4+1}-\dfrac{8}{x^8+1}-\dfrac{16}{x^{16}+1}\)
Tìm x
1) tính
a) \(\dfrac{2}{x^2+2x}+\dfrac{2}{x^2+6x+8}+\dfrac{2}{x^2+10x+24}+\dfrac{2}{x^2+14x+48}\)
b) \(\dfrac{1}{1-x}+\dfrac{1}{1+x}+\dfrac{2}{1+x^2}+\dfrac{4}{1+x^4}+\dfrac{8}{1+x^8}+\dfrac{16}{1+x^{16}}\)
tính:
1x(x+1)+1(x+1)(x+2)+1(x+2)(x+3)+1(x+3)(x+4)+1(x+4)(x+5)+1(x+5)(x+6)+1(x+6)(x+7)+1(x+7)(x+8)
Tính phép tinh sau :
a) \(x-1-\dfrac{x^2-4}{x+1}\)
b) \(\dfrac{3x-1}{6x+2}-\dfrac{3x+1}{2-6x}-\dfrac{6x}{9x^2-1}\)
c)\(\dfrac{x}{x^2-2x}-\dfrac{x^2+4x}{x^3-4x}-\dfrac{2}{x^2+2x}\)
d) \(\dfrac{2x^2+1}{x^3+1}-\dfrac{x-1}{x^2-x-1}-\dfrac{1}{x+1}\)
thuc hien phep tinh
\(\dfrac{3x+1}{\left(x-1\right)^2}-\dfrac{1}{x+1}+\dfrac{x+3}{1-x^2}\)
1\3x-2 - 4\3x+2 - -10x+8\9x^2-4
Giúp mình với.❤️
LÀM TÍNH CỘNG
a)\(\dfrac{1}{5-2b}+\dfrac{2b-2}{3\left(2b-5\right)}\)
b)\(\dfrac{5b}{2b-6}+\dfrac{8}{3-b}\)
c)\(\dfrac{x+2}{x-1}-\dfrac{x-9}{1-x}-\dfrac{x-8}{1-x}\)
d)\(\dfrac{3}{x+2}+\dfrac{6x}{4-x^2}\)
e)\(\dfrac{1}{a+1}+\dfrac{2}{1-a}+\dfrac{5a-1}{a^2-1}\)
GIÚP MÌNH VỚI MAI LÀ NỘP BÀI RỒI
a) x+1/2x-6-4/2x-6 b) 3x-4/6x+3-x-5/6x+3
c) x-1/x-3-3x-8/3-x+3-2x/x-3 d) 3/x+5-5/x-7
e) 3/x+5-5/x-7 f) 2/x-2+3/x+2+5x-18/x2-4
Biến đổi thành tích các biểu thức:
A = 1 + a[(a + 1)9 + (a + 1)8 + (a + 1)7 + …+ (a + 1)2 + a + 2].
