7½×8.88+2.22×7.5+2½×11.1
问题描述:
7½×8.88+2.22×7.5+2½×11.1
简便运算
一又二千零九分之一*3.6+三又五分之三*八又二千零九分之二千零八
2009½×2009½-2008½×2008½
2/1×3+2/3×5+2/5×7···+2/21×23
2009/2010×2001=2009/2010+m求m的值
答
7½×8.88+2.22×7.5+2½×11.1
=7½×(8.88+2.22)+2½×11.1
=7½×11.1+2½×11.1
=(7½+2½)×11.1
=10×11.1
=111求你啦,把剩下的都答了吧~~~一又二千零九分之一*3.6+三又五分之三*八又二千零九分之二千零八=3.6*(1又1/2009+8又2008/2009)=3.6*10=362009½×2009½-2008½×2008½=(2009½+2008½)×(2009½-2008½)=40172/1×3+2/3×5+2/5×7···+2/21×23=1-1/3+1/3-1/5+1/5-1/7+……+1/21-1/23=1-1/23=22/232009/2010×2001=2009/2010+m2009/2010×2001=(2009+2010m)/20102009×2001=2009+2010m2010m=2009×2001-20092010m=2009×2000m=4018/201