Tính: [5^19.3 + 5^19.4] : 5^19

Tính:
a. [5mu19.3+5mu19.4] chia 5mu19 
b.[3mu15.4+5.3mu15]chia 3mu16
c. [2mu13.7+2mu13.9]chia 2mu16
d. [7mu13.5+11.7mu14] chia 7mu13
e.S= 2+2mu2+2mu3+2mu4 .....+ 2mu99+2mu100
f.S=3+3mu2+3mu3+......+3mu15
g.S=5+5mu2+5mu3 +....+5mu20
giup minh nha