a, 4.7.25 + 2.6.5 = (4.25)7 + (2.5)6
= 100.7 + 10.6 = 700 + 60 = 760
b, 164.53 + 47.164 = 164( 53 + 47) = 164 . 100 = 16400
c, 427 + 354 + 373 + 246 + 155 = ( 427 + 373 ) + ( 354 + 246 ) + 155
= 800 + 600 + 155 = 1400 + 155 = 1555
d, 27.(13 + 5) + 18(59 + 14) = 27 . 18 + 18. 73
= 18(27 + 73) = 18. 100 = 1800
Chúc bạn học tốt! ~ 
a) 4.7.25+2.6.5
= (4.25).7+(2.5).6
= 100.7+10.6
= 700+60 = 760
b) 164.53+47.164
= 164.(53+47)
= 164.100 = 16400
c) 427+354+373+246+155
= (427+373)+(354+246)+155
= 800+600+155
= 1400+155 = 1555
d) 27.(13+5)+18.(59+14)
= 27.18+18.73
= 18.(27+73)
= 18.100 = 1800
a)4.7.25+2.6.5
=(4.25).7+(2.5).6
=100.7+10.6
=700+60
=760
b)164.53+47.164
=164.(53+47)
164.100
16400
c)427+354+373+246+155
=(427+373)+(354+246)+155
=800+600+155
=1400+155
=1555
d)27.(13+5)+18.(59+14)
=27.18+18.73
=18.(27+73)
=18.100
=1800
a/ (4.25).7+(2.5).6
=100.7+10.6
=700+60
=760
b/146.(53+47)
=146.100
=14600
c/(427+373)+(354+246)+155
=800+600+155
=1555
d/27.65+18.73
=(27+73).83
=100.83
=8300
