Tính nhanh: 3/-4 + 7/2 - 9/16 + 14/-4 - -9/12 + 5/16

1 tính nhanh
A, 3/-4+7/2-9/16+14/-4--9/12+5/16
B, 41/42+-81/27-27/-243-41/-42+41/-21