a 5.11.2.9 + 9.310 + 4.29.5.9
a 110.9+ 9.310 +580.0
=> 9. ( 110 +310+580)
=> 9.1000=9000
a, = 5.2.9.11 + 9.31.10 + 2.2.29.9.5
= 10.9.11 + 10.9.31 + 10.9.58
= 10.9. ( 11 + 31 + 58 )
= 10.9.100
= 9000
b, = 37.39 + 39.2.14 + 13.5.17 + 4.13.5.11
= 39 ( 37 + 28 ) + 13.5 ( 17 + 44 )
= 39.65 + 65.61
= 65 ( 39 + 61 )
= 65.100
= 6500
xin tiick