Tính nhanh
Tính nhanh:
a, (1+1/2) × (1+1/3) × (1+1/4) × (1/5)
b, 27×29-1/26+27×28
c,20082008×2323/10041004×4646
d,406406×1326/203203×2448
a, (1+1/2) × (1+1/3) × (1+1/4) × (1/5)
b, 27×29-1/26+27×28
c,20082008×2323/10041004×4646
d,406406×1326/203203×2448