Question

Thực hiện phép tính:

a) -2/3 + 3/4 - -1/6 + -2/5

b) -2/3 + -1/5 + 3/4 - 5/6 - (-7/10)

c) 1/2 - -2/5 + 1/3 + 5/7 - -1/6 + -4/35 + 1/17

d) 73,8 - ( 11,5 - 6,2 ) - 0,5

 

 

Answer 1

a) -2/3+3/4+1/6-2/5

=-40/60+45/60+10/60-24/60

=-9/60

=-3/20

Answer 2

b) -2/3-1/5+3/4-5/6+1/10

=-40/60-12/60+45/60-50/60+6/60

=-51/60

=-17/20

Answer 3

c) 1/2+2/5+1/3+5/7+1/6-4/35+1/17

=(1/2+1/3+1/6)+(2/5+5/7-4/35)+1/17

=(3/6+2/6+1/6)+(14/35+25/35-4/35)+1/17

=          1          +               1              +1/17

=                         2                       +1/17

=35/17

Answer 4

d) 73,8 - 5,3 - 0,5

= 68,5 - 0,5

=68