Các câu hỏi tương tự
bài 1:tìm X
phần a, 1/1x2 + 1/ 2x 3 + 1/ 3 x4 + ....+ 1/ X x( X +1)= 499 / 500
phần b,1/1x3 + 1/3x5 + 1/ 5 x 7+ ....+ 1/X x ( X + 2 )= 20 /41
X + 1,23 : 3 = 1,845
X x 1/4 + X x 1/5 + X x 2= 19,6
X/2 x X + X x4 =23,1
X + 3 1/2 + 20 =24 1/4 ( hỗn số x a/b Nha )
(1+1/1x3)x(1+1/2x4)x(1+1/3x5)x(1+1/4x6)x(1+1/5x7)
{1-1/2}x{1-1/3}x{1-1/4}x....x{1-1/18}x{1-1/19}x{1-1/20} = ?
(1-1/2) x (1-1/3) x (1 -1/4) x ... x (1-1/18) x (1-1/19) x ( 1-1/20)
a,(1/5-1/7):(30%-20%);b,(3-2 và1/2)x(1/2-1/3)
c,1/2x4+1/4x6+...+1/18x20;d,1/1+2+1/1+2+3+...+1/1+2+3+...+2018
h,1/1.6+2/6.11+2/11.16+2/16.21;g,1/1x2x3+1/2x3x4+...+1/18x19x20
Bài 1:Tính (1-1/2)x(1-1/3)x(1-1/4)x...x(1-1/18)x(1-1/19)x(1-1/20)
tìm x biết ( 1/2x4 + 1/4x6 + 1/6x8 ...+ 1/18x20) x 10 - \(x\) = 0
tìm A,B biết
A=( 1+ 1/1x3 ) x (1+1/2x4) x (1+1/3x5) x ( 1+1/4x6 ) x(1+1/5x7)
B = 1/2+1/4+1/8 +1/6 + .... + 1/128+1/256
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