699-123 =(699+1)-(123+1)=700-124=576
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699-123 =(699+1)-(123+1)=700-124=576
12*2=???
ai k mk mk k lai
56+4=??
ai k mk mk k lai
12-12=
Ai k mk , mk k lai
1900+102+3=
ai k mk mk k lai
3.4.12.12.12.12
luy thua
ai k mk mk k lai
56+44 +0+35+65
ai k mk mk k lai
x+100=200-300
ai k mk rui mk k lai
x+90+10=100-40
ai k mk rui mk k lai
x+100=200-100-100
ai k mk rui mk k lai