A = ( $\frac{5}{2}$ – $\frac{3}{4}$ + $\frac{4}{3}$ ) – ( $\frac{4}{3}$ + $\frac{3}{4}$ – 2 ) – ( $\frac{1}{2}$ – $\frac{3}{7 }$ )
A = ( $\frac{5}{2}$ – $\frac{3}{4}$ + $\frac{4}{3}$ ) – ( $\frac{4}{3}$ + $\frac{3}{4}$ – 2 ) – ( $\frac{1}{2}$ – $\frac{3}{7 }$ )
By Everleigh
`A= (5/2 – 3/4 + 4/3) – (4/3 + 3/4 – 2) – (1/2 – 3/7)`
`A=5/2 – 3/4 + 4/3- 4/3 – 3/4 +2 – 1/2 + 3/7`
`A= (5/2 – 1/2) – (3/4 + 3/4) + (4/3 – 4/3) + 2 + 3/7`
`A= 2 – 3/2 + 2 + 3/7`
`A= 4 – 3/2 + 3/7`
`A= 5/2 + 3/7`
`A=41/14`
Vậy `A= 41/14`
Đáp án:
$\\$
`A = (5/2 – 3/4 + 4/3) – (4/3 + 3/4 – 2) – (1/2 – 3/7)`
`↔ A = 5/2 – 3/4 + 4/3 – 4/3 – 3/4 + 2 – 1/2 + 3/7`
`↔ A = (5/2 – 1/2 + 2)+ (-3/4 – 3/4) + (4/3 – 4/3) + 3/7`
`↔ A = (2 + 2) – 3/2 + 3/7`
`↔ A = 4 – 3/2 + 3/7`
`↔ A = 8/2 – 3/2 + 3/7`
`↔ A = 5/2 + 3/7`
`↔ A = 35/14 + 6/14`
`↔ A = 41/14`
Vậy `A = 41/14`