如题所述
ï¼1ï¼38Ã29+38 ï¼2ï¼39Ã101 ï¼3ï¼378+527+73+122
=38Ã29+38Ã1 =39Ãï¼100+1ï¼ =ï¼378+122ï¼+ï¼527+73ï¼
=38Ãï¼29+1ï¼ =39Ã100+39Ã1 =500+600
=38Ã30 =3900+39 =1100
=1140 =3939
(4) 72Ã125 ï¼5ï¼25Ã78Ã4 ï¼6ï¼45Ã98
=125Ã8Ã9 =25Ã4Ã78 =45Ãï¼100-2ï¼
=1000Ã9 =100Ã78 =45Ã100-45Ã90
=9000 =7800 =4500-90
=4410
ï¼7ï¼25Ã32Ã125 ï¼8ï¼1456-387-613
=ï¼25Ã4ï¼Ãï¼8Ã125ï¼ =1456-ï¼387+613ï¼
=100Ã1000 =1456-1000
=100000 =456
ï¼9ï¼345Ã101-345 ï¼10ï¼154Ã89-54Ã89
=345Ã101-345Ã1 =89Ãï¼154-54ï¼
=345Ãï¼101-1ï¼ =89Ã100
=345Ã100 =8900
=34500
=38Ã29+38Ã1 =39Ãï¼100+1ï¼ =ï¼378+122ï¼+ï¼527+73ï¼
=38Ãï¼29+1ï¼ =39Ã100+39Ã1 =500+600
=38Ã30 =3900+39 =1100
=1140 =3939
(4) 72Ã125 ï¼5ï¼25Ã78Ã4 ï¼6ï¼45Ã98
=125Ã8Ã9 =25Ã4Ã78 =45Ãï¼100-2ï¼
=1000Ã9 =100Ã78 =45Ã100-45Ã90
=9000 =7800 =4500-90
=4410
ï¼7ï¼25Ã32Ã125 ï¼8ï¼1456-387-613
=ï¼25Ã4ï¼Ãï¼8Ã125ï¼ =1456-ï¼387+613ï¼
=100Ã1000 =1456-1000
=100000 =456
ï¼9ï¼345Ã101-345 ï¼10ï¼154Ã89-54Ã89
=345Ã101-345Ã1 =89Ãï¼154-54ï¼
=345Ãï¼101-1ï¼ =89Ã100
=345Ã100 =8900
=34500
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