Tính nhanh:

a) 23.56 + 56.77;

b) 32.19 + 32;

c) 35.34 + 35,86 + 65.75 + 65.45;

d) 43.17 + 29.57 + 13.43 + 57;

e) 3.25.8+4.37.6 + 2.38.12

f) 64.16+81.84+17.16