C = 1/15 + 5/19 - 4/3+(4/5 - 5/19 + 1/3 ) -7/16 + 14/32D = - ( 2/19 - 9/23 + 7/28) + ( -15/38 +14/23 +1/4) - 5/8E = (7-4/3 +1/3 ) - ( 6+5/4 - 4/3) - ( 5 - 7/4 + 5/3 )G = 3/4 - [ (-3/5 ) - ( 1/12 + 2/9 ) - (2/9 - 5/3 ) ]
Đăng ký qua Facebook hoặc Google: