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`
