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Đáp án`+`Giải thích các bước giải`:`

 `a)`

`(5/2-1)xx7/6-1/6`

`=3/2 xx 7/6-1/6`

`=7/4-1/6`

`=19/12`

`b)`

`2 3/7 xx 1/2-1/2 xx 3/7+1/3`

`=1/2 xx (2 3/7-3/7)+1/3`

`=1/2 xx (2+3/7-3/7)+1/3`

`=1/2 xx 2+1/3`

`=1+1/3`

`=4/3`

`c)`

`12,5+21,7-1,7+7,5`

`=(12,5+7,5)+(21,7-1,7)`

`=23+20`

`=43`

`d)`

`(1354+354:6)+13,2`

`=(1354+59)+13,2`

`=1413+13,2`

`=1426,2`

`e)`

`(1-1/2) xx (1-1/3) xx (1-1/4) xx ... xx (1-1/2023)`

`=1/2 xx 2/3 xx 3/4 xx ... xx 2022/2023`

`=(1 xx 2 xx 3 xx ... xx 2022)/(2 xx3 xx 4 xx .... xx 2023)`

`=1/2023`

`@yue`

Đáp án + Giải thích các bước giải :

`a. ( 5/2 - 1 ) × 7/6 - 1/6 `

` = 3/2 × 7/6 - 1/6 `

` = 7/4 - 1/6 `

` = 19/12 `

`b. 2 3/7 × 1/2 - 1/2 × 3/7 + 1/3 `

` = 1/2 × ( 2 3/7 - 3/7 ) + 1/3 `

` = 1/2 × ( 2 + 3/7 - 3/7 ) + 1/3 `

` = 1/2 × 2 + 1/3 `

` = 1 + 1/3 `

` = 4/3 `

`c. 12,5 + 21,7 - 1,7 + 7,5`

` = ( 12,5 + 7,5 ) + ( 21,7 - 1,7 ) `

` = 20 + 20 `

` = 40 `

`d. ( 1354 - 354 : 6 ) + 13,2 `

` = ( 1354 - 59 ) + 13,2 `

` = 1295 + 13,2 `

` = 1308,2 `

`e. ( 1 - 1/2 ) × ( 1 - 1/3 ) × ( 1 - 1/4 ) ×...× ( 1 - 1/2023 ) `

` = 1/2 × 2/3 × 3/4 ×...× 2022/2023 `

` = ( 1 × 2 × 3 ×...× 2022)/(2 × 3 × 3 ×...× 2023)`

` = 1/2023 `

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