Câu1

( x-7/4)+( x-6/3)+( x-5/2)+( x+81/7)=0

Câu2

( 1/1×101)+( 1/2×102)+( 1/3×103)+(1/10×11×X=(1/1×11)+(1/2×12)+...+(1/100×110)

Câu3

( x-1/2013)+( x-2/2012)+( x-3/2011)+...+( x-2012/2) =2012

Tìm x

\(\dfrac{x+1}{100}+\dfrac{x+2}{101}=\dfrac{x+3}{102}-1\)

1, cho a^100+b^100=a^101+b^101=a^101+b^101=a^102+b^102.CM a+b/b=a^2+b^2/a^2b^2

2,tính  gtbt:A= x/xy+x+1+y/y+1+yz+z/1+z+xz

3, cho a,b,c,d>0 TM:a^2+b^2=1 và a^4/b+c^4/d=1/b+d CM:a^2016/b^1003+c^2006/d^1003=2/(b+d)^1003

Bài 1: Tính nhanh 

A, 13 x 126 + 37 x 126 - 49 x 126

B, ( 1 + 2 + 4 + 8+.....+ 512 ) x ( 101 x 102 - 101 x 101 - 50 - 51 )

(1-2+3-4+5-6+7-8+...+101-102+103) * x-120=2012

Tính nhanh :

1 . ( 19 x 43 - 26928 : 33 ) x ( 16112 : 53 - 10,1 x 30 )

2. 1996 x 1995 - 996 + 1000 - 1996 x 1994 

3. ( 1 + 2 + 4 + ... + 512 ) x ( 101 x 102 - 101 x 101 - 50 - 51 )

4. 10,09 x 100 + 2009 + 200,9 : 0,1 + 2,009 : 0,001

Tính

a) (x-1/2)+(x-1/4)+(x-1/8)+...+(x-1/512)

Tìm x

a) (x-1/1×2)+(x-1/2×3)+...+(x-1/100×101)

b) (x-1)+(x-2)+(x-3)+...+(x-101)=5050

c) x+1/2+1/3+1/4+...+1/100=3/2+4/3+5/4++...+101/100

tìm x

x(1/1-1/101+1/2-1/102+1/3-1/103+1/4-1/104+1/10-1/110):100=(1/1-1/1+1/2-1/12+...+1/100-1/110):10

ai nhanh mình tick

Cho A = 1 x 2 + 2 x 3 + 3 x 4 + 4 x 5 + ... + 100 x 101

và B = 1 x 3 + 2 x 4 + 3 x 5 + 4 x 6 + ... + 100 x 102

Vậy B - A = ?

1 x 3+2 x 4+3 x 5+4 x 6+...+99 x 101+100 x 102