Question

  đang cần gấp trình bày hẳn ra cho tui nha mn cảm ơn trước

Answer 1

#\(N\)

`1, -3/7 +5/13 - 4/7 +-8/13 = (-3/7 + -4/7) + (5/13 --8/13) = -1+1=0`

`2, -5/14 - 2/14 + 1/8 + 1/8 = (-5/14 - 2/14) + (1/8 + 1/8) = -1/2 + 1/4 =-1/4`

`3, -5/22 -1 +3/2-6/22 = (-5/22 - 6/22) -1+3/2 = -1/2 - 1+3/2 = -3/2 + 3/2 = 0 `

`4, -1/2 + 1/4 + 2/8 -11/77 = -1/2+1/4 +1/4 -11/77 = -1/2 +(1/4+1/4)-1/7 =-1/2 + 1/2 - 1/7 =0-1/7 = -1/7`

`5, 2/5 + 5/4+(-2/5+5/4)-5/2 = 2/5+5/4+-2/5+5/4-5/2 = (2/5+-2/5)+(5/4+5/4)-5/2 = 0+5/2-5/2 = 5/2 - 5/2 = 0`

Answer 2

1: =-3/7-4/7+5/13+8/13

=-1+1=0

2: =-5/14-2/14+1/4

=-1/2+1/4

=-1/4

3: =-5/22-6/22+3/2-1

=-1/2-1+3/2

=0

4: =-4/8+2/8+2/8-1/7=-1/7

5: =2/5+5/4-2/5+5/4-5/2

=5/2-5/2

=0