Toán 1-1/2+1-1/6+1-1/12+1-1/12+1-1/20+1-1/30+1-1/42+1-1/56+1-1/72+1-1/89 31/08/2021 By Mary 1-1/2+1-1/6+1-1/12+1-1/12+1-1/20+1-1/30+1-1/42+1-1/56+1-1/72+1-1/89
Giải thích các bước giải: `1-1/2+1-1/6+1-1/12+1-1/12+1-1/20+1-1/30+1-1/42+1-1/56+1-1/72+1-1/89` `=1/2 +5/6+11/12+19/20+29/30+41/42+55/56+71/72+89/90` `=1-1/2+1-1/12+1-1/20+1-1/30+1-1/42+1-1/56+1-1/72+1-1/90` `=10-(1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90)` `=10-(1/(1.2)+1/(2.3)+1/(3.4)+….+1/(9.10))` `=10-(1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+…+1/9-1/10)` `= 10-(1-1/10)=10-9/10= 91/10` Trả lời
Giải thích các bước giải: 1-1/2+1-1/6+1-1/12+1-1/12+1-1/20+1-1/30+1-1/42+1-1/56+1-1/72+1-1/89 =1/2 +5/6+11/12+19/20+29/30+41/42+55/56+71/72+89/90 =1-1/2+1-1/12+1-1/20+1-1/30+1-1/42+1-1/56+1-1/72+1-1/90 =9-(1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90) =9-[1/(1.2)+1/(2.3)+1(3.4)+….+1/(9.10) =9-(1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+…+1/9-1/10) 9-(1-1/10)=9-9/10=81/10 cho mik ctlhn nha cảm ơn bạn chúc bạn học tốt Trả lời
Giải thích các bước giải:
`1-1/2+1-1/6+1-1/12+1-1/12+1-1/20+1-1/30+1-1/42+1-1/56+1-1/72+1-1/89`
`=1/2 +5/6+11/12+19/20+29/30+41/42+55/56+71/72+89/90`
`=1-1/2+1-1/12+1-1/20+1-1/30+1-1/42+1-1/56+1-1/72+1-1/90`
`=10-(1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90)`
`=10-(1/(1.2)+1/(2.3)+1/(3.4)+….+1/(9.10))`
`=10-(1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+…+1/9-1/10)`
`= 10-(1-1/10)=10-9/10= 91/10`
Giải thích các bước giải:
1-1/2+1-1/6+1-1/12+1-1/12+1-1/20+1-1/30+1-1/42+1-1/56+1-1/72+1-1/89
=1/2 +5/6+11/12+19/20+29/30+41/42+55/56+71/72+89/90
=1-1/2+1-1/12+1-1/20+1-1/30+1-1/42+1-1/56+1-1/72+1-1/90
=9-(1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90)
=9-[1/(1.2)+1/(2.3)+1(3.4)+….+1/(9.10)
=9-(1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+…+1/9-1/10)
9-(1-1/10)=9-9/10=81/10
cho mik ctlhn nha
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