1) 11+22+33+44+66+77+88+99=(11+99)+(22+88)+(33+77)+(44+66)=
=110+110+110+110=440
2) (350+105+250)-(111+28+459)=600+105-598=(600-598)+105=2+105=107
3) (450+20+50)+(450-20-50)=(450+450)+(20+50-20-50)=900+0=900
4) (45+12+95)-(91+42+19)=(140+12)-(110+42)=152-152=0
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1) 11+22+33+44+66+77+88+99=(11+99)+(22+88)+(33+77)+(44+66)=
=110+110+110+110=440
2) (350+105+250)-(111+28+459)=600+105-598=(600-598)+105=2+105=107
3) (450+20+50)+(450-20-50)=(450+450)+(20+50-20-50)=900+0=900
4) (45+12+95)-(91+42+19)=(140+12)-(110+42)=152-152=0