Toán tính nhanh 1/2+2/8+3/28+4/77+5/176+6/352 02/09/2021 By Amaya tính nhanh 1/2+2/8+3/28+4/77+5/176+6/352
Đáp án: ` 21/22` Giải thích các bước giải: `1/2+2/8+3/28+4/77+5/176+6/352` ` =1/1.2 + 1/2.4 + 1/4.7 + 1/7.11 + 1/11 .16 + 1/16.22` `= 1 – 1/12 + 1/2 – 1/4 + 1/4 – 1/7 + 1/7 – 11 + 1/11- 1/16 + 1/16 – 1/22` `= 1 – 1/22` `=22/22 – 1/22 = 21/22` Trả lời
1/2+2/8+3/28+4/77+5/176+6/352 =1/1.2+2/2.4+3/4.7+4/7.11+5/11.16+6/16.22 =1/1-1/2+1/2-1/4+1/4-1/7+1/7-1/11+1/11-1/16+1/16-1/22 =1-1/22 =21/22 Trả lời
Đáp án:
` 21/22`
Giải thích các bước giải:
`1/2+2/8+3/28+4/77+5/176+6/352`
` =1/1.2 + 1/2.4 + 1/4.7 + 1/7.11 + 1/11 .16 + 1/16.22`
`= 1 – 1/12 + 1/2 – 1/4 + 1/4 – 1/7 + 1/7 – 11 + 1/11- 1/16 + 1/16 – 1/22`
`= 1 – 1/22`
`=22/22 – 1/22 = 21/22`
1/2+2/8+3/28+4/77+5/176+6/352
=1/1.2+2/2.4+3/4.7+4/7.11+5/11.16+6/16.22
=1/1-1/2+1/2-1/4+1/4-1/7+1/7-1/11+1/11-1/16+1/16-1/22
=1-1/22
=21/22