1/1.2 + 1/2.3 + 1/3.4 + 1/4.5
= 1- 1/2 + 1/2 - 1/3 + 1/3 - 1/4 + 1/4 - 1/5
= 1 - 1/5 = 4/5
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Các câu hỏi tương tự
2*x+1/2*x + 6*x+1/6*x +12*x+1/12*x +20*x+1/20*x= 5.tìm x
2*x+1/2*x+6*x+1/6*x+12*x+1/12*x+20*x+1/20*x=5.Tim x
tinh bang cach thuan tien nhat
1/2+1/6+1/12+1/20
1/2+1/6+1/12+1/20+..........+1/9900
1/2+1/3+1/4+1/8+1/16
1/2+1/3+1/4+1/8+1/16+........+1/512
{1+1/2+1/6}:{1/6+1/12+1/20}
các bạn giải hộ mh bài này nhé
b1,
a,1/2 + 1/6 + 1/12 + 1/20 +...+ 1/9500
b, 3/2 - 5/6 - 7/12 - 9/20 - ....- 19/90
1/2 + 1/6 + 1/12 + 1/20 + 1/30
( 1/2 + 1/6 + 1/12 + 1/20+......+1/72) : X = 1/2+ 1/4
( 1/2 + 1/6 + 1/12 + 1/20 ) × ( 20 - x ) = 4
Tìm x
1/2+1/6+1/12+1/20+1/30+1/42