Tìm x
a, 11/-40 + 4/5 – |3/4-1 5/12|= 3/20-X
b, 2 1/4 – 1 2/3 +X= 5/4 – |1/2-7/8|
c, |4/35-5/2| – ( 1/5-X+1/7)= 3/14
d, 7/4-|3/10-7/20|-X= 2-|1/4-9/10|
e, 3-(2/3+X-2 3/4)= 1+|2 1/3 -1/2|
f, 1/2-(5/3-X +1/2)= 2-|1- 2/3 -1/4|
giúp mk với chiều mk nộp rồi
Đáp án:
a, `x = 7/24`
b, `x=7/24`
c, `x = (-64)/35`
d, `x = 7/20`
e, `x = 9/4`
f, `x=43/12`
Giải thích các bước giải:
a, `11/(-40) + 4/5 – |3/4 – 1 5/12| = 3/20 – x`
`⇒21/40 – 2/3 = 3/20 – x`
`⇒ x = 3/20 – 21/40 + 2/3`
`⇒ x= 7/24`
b, `2 1/4 – 1 2/3 + x = 5/4 – |1/2 – 7/8|`
`⇒ 7/12 + x = 5/4 – 3/8`
`⇒ x = 5/4 – 3/8 – 7/12`
`⇒ x=7/24`
c, `|4/35 – 5/2| – (1/5 – x + 1/7) = 3/14`
`⇒ 167/70 – 1/5 + x – 1/7 = 3/14`
`⇒ 143/70 + x = 3/14`
`=> x = 3/14 – 143/70`
`⇒ x = (-64)/35`
d, `7/4 – |3/10 – 7/20| – x = 2 – |1/4 – 9/10|`
`⇒ 7/4 – 1/20 – x = 2 – 13/20`
`⇒ 17/10 -x = 27/20`
`⇒ x =17/10 – 27/20`
`⇒ x = 7/20`
e, `3 – (2/3 + x – 2 3/4) = 1 + |2 1/3 – 1/2|`
`⇒ 3 – 2/3 – x + 2 3/4 = 1 + 11/6`
`=> 61/12 – x = 17/6`
`=> x = 61/12 – 17/6`
`=> x =9/4`
f, `1/2 – (5/3 – x + 1/2) = 2 – |1 – 2/3 – 1/4|`
`=> 1/2 – 5/3 + x -1/2 = 2 – 1/12`
`=> x – 5/3 = 23/12`
`=> x = 23/12 + 5/3`
`=> x = 43/12`
Đáp án:
`a, 11/-40 + 4/5 – |3/4-1 (5)/12|= 3/20-x`
`21/40 – 2/3 = 3/20 – x`
`3/20 – x = -17/120`
`x = 7/24`
`b, 2 (1)/4 – 1 (2)/3 +x = 5/4 – |1/2-7/8|`
` 7/12 + x = 5/4 – -3/8`
`7/12 + x = 13/8`
` x = 25/24 `
`c, |4/35-5/2| – ( 1/5- x + 1/7)= 3/14`
` 167/70 – ( 1/5- x + 1/7) = 3/14`
`1/5 – x + 1/7 = 76/35`
`x + 1/7 = -69/35`
`x = -74/35`
`d, 7/4-|3/10-7/20|-x= 2-|1/4-9/10|`
` 7/4 – 1/20 – x = 2 – 13 /20`
` 17/10 – x = 27/20`
`x = 7/20`
`e, 3-(2/3+x-2 (3)/4)= 1+|2 (1)/3 -1/2|`
` 3-(2/3+x-2 (3)/4) = 1 + 11/6`
`3-(2/3+x -2 (3)/4)= 17/6`
`2/3 + x – 11/4 = 17/6`
` 2/3 + x = 17/6 + 11/4 `
` 2/3 + x = 67/12`
`x = 59/12`
`f, 1/2-(5/3-x+1/2)= 2-|1- 2/3 -1/4|`
`11/2-(5/3-x+1/2) = 23/12`
` 5/3 – x + 1/2 = -17/12`
`x + 1/2 = 37/12`
`x = 31/12`
Good luck !