24.19+29.24+18.24+24.33+24
=24.(19+29+18+33+1)
=24.100
=2400
2.31.21+4.6.42+8.27.3
=(2.21).31+(4.6).42+(8.3).27
=24.31+24.42+24.27
=24.(31+42+27)
=24.100
=2400
341.67+341.16+659.83
=341.(67.16)+659.83
=341.83+659.83
=83.(659+341)
=83.1000
=83000
42.53+47.156-47.114
=42.53+47.(156-114)
=42.53+47.42
=42.(53+47)
=42.100
=4200
(2+4+6+...+100).(36.333-108.111)
=(2+4+6+...+100).(36.3.111-108.111)
=(2+4+6+...+100).111(36.3-108)
=(2+4+6+...+100).111.0
=0
19991999.1998-19981998.1999
=1999.10001.1998-1998.10001.1999
=0