728x99=728*(100-1)=72800-728=72072
562x101-562=562*(101-1)=56200
810÷45=90*9/45=45*18/45=18
63x37+37x37=37*(63+37)=3700
4.82-1.75+2.18-3.25=(4.82+2.18)-(1.75+3.25)=7-5=2
728x99=728*(100-1)=72800-728=72072
562x101-562=562*(101-1)=56200
810÷45=90*9/45=45*18/45=18
63x37+37x37=37*(63+37)=3700
4.82-1.75+2.18-3.25=(4.82+2.18)-(1.75+3.25)=7-5=2