用简便方法计算199x9+199和78x101-78
ç¨ç®ä¾¿æ¹æ³è®¡ç®199x9+199å78x101-78
199*9+199
=199*ï¼9+1ï¼
=199*10
=1990
78*101-78
=78*ï¼101-1ï¼
=78*100
=7800
199*9+199
=199*ï¼9+1ï¼
=199*10
=1990
78*101-78
=78*ï¼101-1ï¼
=78*100
=7800
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