Tính nhanh: [-5/13 - (3/5 + 3/13 - 4/10)] : -15/11

a ) [ -5/13 - ( 3/5 + 3/13 - 4/10 )] : -15/11
b ) ( 3/9 - 9/18 ) + 3/6 - ( 1/3 - 1/2 ) - 5/13