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125*8=125*(10-2)=1250-250=1000
38*25=25*(40-2)=25*40-25*2=1000-50=950
58*11=58*(10+1)=580+58=580+20+38=638
125*8=(100+25)*8=800+200=1000
38*25=(30+8)*25=750+200=950
58*11=(50+8)*11=550+88=638