a)(12/32+5/-20-10/24):2/3
=-7/24:2/3
=-7/16
b)2/7x2/4-2/7x1/4
=2/7x(2/4-1/4)
=2/7x1/4
=1/14
c)14/19+13/17+35/43+5/19+8/43
=(14/19+5/19) +(35/43+8/43)+13/17
= 1 + 1 +13/17
= 2 +13/17
= 47/17
d)-5/7x2/11+-5/7x9/11+1/5/7
=-5/7x(2/11+9/11)+12/7
=-5/7 x 1 +12/7
= 5/7 +12/7
= 17/7
e)11/3/13-(2/4/7+5/3/13)
=11/3/13-2/4/7+5/3/13
=146/13 -18/7+68/13
=(146/13-68/13)+18/7
= 6 +18/7
= 60/7
Chúc bạn học tốt +5sao+ctrhn nha