1 thực hiện phép tính. a) (4_1/9 +3_1/4).2_1/2 +2_3/4. b) 1+(9/10-4/5)÷3_1/6. c) -2/11×11/9 + (-2/11) ×8/19 + (-4/11). d) -5/18 +5/9 -11/36

a) 

a) (4_1/9 +3_1/4).2_1/2 +2_3/4.

= (37/9+13/4).5/2+11/4

= 265/36.5/2+11/4

= 1325/72+11/4

= 1523/72

b) 1+(9/10-4/5)÷3_1/6.

= 1+ 1/10 : 19/6

= 3/95

c) -2/11×11/9 + (-2/11) ×8/19 + (-4/11).

= -2/9 + -16/99 +(-4/11)

=-38/99 + -74/99

= -112/99

d) -5/18 +5/9 -11/36

=5/18 -11/36

= -1/36

( chúc bạn học tốt)