Bài `1:`
`1) 11 3/13 - (2 4/7 + 5 3 /13)`
` = 11 + 3/13 - ( 2 + 4/7 + 5 + 3/13)`
` = 11 + 3/13 - 2 - 4/7 - 5 - 3/13`
` = (11- 2-5)- 4/7 - (3/13 - 3/13)`
` = 4 - 4/7 - 0 `
` = 24/7`
`2) 4/7 + 5/6 : 5 - 0,375 . (-2)^2`
` = 4/7 + 5/6 . 1/5 - 3/8 . 4`
` = 4/7 + 1/6 - 3/2`
` = 24/42 + 7/42 - 63/42`
` =(-16)/21`
`3) 1/4 + 3/4 . (-1/2 + 2/3)`
` = 1/4 + 3/4 . 1/6`
` = 1/4 + 1/8 `
` = 3/8`
Bài `2:`
`a) (3 1/2 + 2x) . 2 2/3 = 5 1/3`
`=> (7/2 + 2x) . 8/3 = 16/3`
`=> 7/2 + 2x = 16/3 : 8/3`
`=> 7/2 + 2x = 2`
`=> 2x = 2 -7/2`
`=> 2x = -3/2`
`=> x = -3/4`
Vậy `x= -3/4`
`b) |2x+3|=5`
`=> 2x+3=5` hoặc `2x+3=-5`
`+)2x+3=5`
`=> 2x = 2`
`=> x = 1`
`+)2x+3=-5`
`=> x = -8`
`=> x = -4`
Vậy `x \in{ 1 ; -4}`
`c)(x-2)/4 = (5+x)/3`
`=> 3.(x-2) = 4.(5+x)`
`=> 3x - 6 = 20 + 4x`
`=> 3x - 4x = 20 + 6`
`=> -x = 26`
`=> x = -26`
Vậy `x = -26`
