Tính a) 3/4 - 2/5 + 5/12= b) 15/7 - 4/3 -2/9= c) 4/5 - ( 6/15 + 1/5 ) = d) 1/2 -1/3 + 1/4 - 1/6=

a ) 3/4 - 2/5 + 5/12 = 7/20 + 5/12 = 23/30

b ) 15/7 - 4/3 - 2/9 = 17/21 - 2/9 = 37/63

c ) 4/5 - ( 6/15 + 1/5 ) = 4/5 - 1/5 = 3/5

d ) 1/2 -1/3 + 1/4 - 1/6 = 1/6 + 1/12 = 1/4

mong bạn đánh gia hay nhất.