如题所述
75X99å75=75Xï¼99+1ï¼=7500
44X25=4X11X25=ï¼4X25ï¼X11=1100
233X101ä¸233=233Xï¼101-1ï¼=23300
99X187=ï¼100-1ï¼X187=100X187-1X187=18513
123X8å16=123X8+2X8=ï¼123+2ï¼X8=1000
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