Sửa đề: 1/2*4
B=1/2(2/2*4+2/4*6+...+2/100*102)
=1/2(1/2-1/4+1/4-1/6+...+1/100-1/102)
=1/2*50/102
=25/102
(1/2x4+1/4x6+1/6x8+1/8x10)xy=1/3
tìm y:
(2/2x4 + 2/4x6 + 2/6x8 + 2/8x10) x y = 1/3
(1phan 2x4+1 phan 4x6+1 phan 6x8+1phan 8x10)xy 1phan 3
tìm y :( 1/2x4 + 1/4x6 + 1/6x8 + 1/8x10 ) x y = 1/3
sos cố gắng giúp mik vs . mình cảm ơn
Tính :
N = ( 1/2x4 + 1/4x6 + 1/6x8 + 1/8x10 + ....... + 1/98 X 100 ) : ( 1/2 + 1/4 + 1/8 + 1/16 + ........ + 1/512 )
Bài 1 tìm y
a) (1/2x4+1/4x6+1/6x8+1/8x10)x y =1/3
b) y:8+y x8-56,78=69,11x2
Tìm y biết \(\left(\frac{1}{2x4}+\frac{1}{4x6}+\frac{1}{6x8}+\frac{1}{8x10}\right).y=\frac{1}{3}\)
\(\frac{4}{2x4}+\frac{4}{4x6}+\frac{4}{6x8}+\frac{4}{8x10}+...+\frac{4}{16x18}+\frac{4}{18x20.}\)
1/2x4+1/4x6+1/6x8+...+1/96x98+1/98x100=?
1/2x4+1/4x6+1/6x8+...+1/96x98+1/98x100
