怎样计算简便?97*90/7 2009/2008*2010
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怎样计算简便?
97*90/7 2009/2008*2010
97*90/7=（90+7）*90/7=90*90/7+7*90/7=810/7+90=1440/7
2009/2008*2010 =(2008+1)*(2008+2)/2008=2008+3+2/2008=2011+1/1004
8730/7 4038090/2008
怎样计算简便?
97*90/7 2009/2008*2010
97*90/7=（90+7）*90/7=90*90/7+7*90/7=810/7+90=1440/7
2009/2008*2010 =(2008+1)*(2008+2)/2008=2008+3+2/2008=2011+1/1004
8730/7 4038090/2008