237.(101-1)+34.(13+43)
237.100+34.56
23700+1904=25604
28.100.(100-1)+10.19.2+2.10.3.26+4.10.(10+1)
280000-2800+380+1560+400+40
=279580
a) 237.101-237+13.34+34.43
= 237(101-1)+34(13+43)
= 237.100+34.56
=23700+1904
=25604
b) 280.99+190.2+20.78+40.11
= 2.140.99+190.2+2.10.78+2.20.11
= 2 (140.99+190+10.78+20.11) = 2.15050 = 30100
30100la ket qua dung 279580 la mk ghi nham