a,1/5+4/11+4/5+7/11
=(1/5+4/5)+(4/11+7/11)
=1+1
=2
Chọn B
1367.54+1367.45+1367
=1367.(54+45+1)
=1367.100
=136700
a) 1/5 + 4/11 + 4/5 + 7/11 = (1/5 + 4/5) + (4/11 + 7/11) = 1 + 1 = 2
=> B
b) 1367 x 54 + 1367 x 45 + 1367 = 1367 x (54 + 45 + 1) = 1367 x 100 = 136700