T=1/2+5/6+11/ 12+...+89/90 +109/110+10/11 = ?
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Tính T=1/2+5/6+11/12+...+89/90+109/110+10/11
1/2 + 5/6 + 11/12 + ... + 89/90 + 109/110 + 10/11
= (1 - 1/2) + (1 - 1/6) + (1 - 1/12) + ... + (1 - 1/90) + (1 - 1/110) + 10/11
= (1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1) - (1/1*2 + 1/2*3 + 1/3*4 + ... + 1/10*11) + 10/11
= 9 - (1 - 1/11) + 10/11
= 9 - 10/11 + 10/11 = 9
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T=1/2+5/6+11/12+...+89/90+109/110+10/11
T= (1 -1/2) + ( 1 - 1/6) + (1-1/12) + (1-1/20)+(1-1/30)+... + (1 - 1/90) + (1- 1/110) + 10/11
T= 1x10 –(1/2+1/6+1/12+1/20+……..+1/90+1/110)+10/11
T=10 – (1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+……+1/9-1/10+1/10-1/11)+ 10/11
T= 10 – (1-1/11)+10/11 = 10-10/11+10/11
T=10
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T = 1/2 + 5/6 + 11/12 + ... + 89/90 + 109/110 + 10/11.Nêu cách làm các bạn nhé!
1/2+5/6+11/12+..+89/90+109/110+10/11
1/2 +5/6 + 11/12 ... + 89/90 + 109/110 + 10/11
1/2 + 5/6 +11/12 +...+ 89/90 + 109/110 + 10/11
= (1 - 1/2) + ( 1 - 1/6) + (1 - 1/12) + (1 - 1/20) +( 1 - 1/30) +... + (1 - 1/90) + (1- 1/110) + 10/11
= 1 x 10 –(1/2 + 1/6 + 1/12 + 1/20 +……..+ 1/90 + 1/110) + 10/11
= 10 – (1 - 1/2 + 1/2 - 1/3 + 1/3 - 1/4 + 1/4 - 1/5 +……+ 1/9 - 1/10 + 1/10 - 1/11 ) + 10/11
= 10 – (1 - 1/11) + 10/11
= 10 - 10/11 + 10/11
= 10
1/2+5/6+11/12+...+89/90+109/110+10/11 =?
tính 1/2 + 5/6 + 11/12 + .....+89/90 + 109/110 + 10/11
Tính:1/2+5/6+11/12+...+89/90+109/110+10/11
1\2+5\6+11\12+...+89\90+109\110+10\11
T=:1/2+5/6+11/12+.....+89/90+109/110+10/11
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T=1/2+5/6+11/12+...+89/90+109/110+10/11
T= (1 -1/2) + ( 1 - 1/6) + (1-1/12) + (1-1/20)+(1-1/30)+... + (1 - 1/90) + (1- 1/110) +(10/11)
T= 1x10 –(1/2+1/6+1/12+1/20+……..+1/90+1/110)+10/11
T=10 – (1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+……+1/9-1/10+1/10-1/11)+ 10/11
T= 10 – (1-1/11)+10/11 = 10-10/11+10/11
T=10
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T=1/2+5/6+11/12+...+89/90+109/110+10/11
T= (1 -1/2) + ( 1 - 1/6) + (1-1/12) + (1-1/20)+(1-1/30)+... + (1 - 1/90) + (1- 1/110) +(10/11)
T= 1x10 –(1/2+1/6+1/12+1/20+……..+1/90+1/110)+10/11
T=10 – (1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+……+1/9-1/10+1/10-1/11)+ 10/11
T= 10 – (1-1/11)+10/11 = 10-10/11+10/11
T=10
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