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7½×8.88+2.22×7.5+2½×11.1

来源:学生作业帮 编辑:大师作文网作业帮 分类:数学作业 时间:2024/11/11 15:56:49
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
7½×8.88+2.22×7.5+2½×11.1
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
再问: 求你啦,把剩下的都答了吧~~~
再答: 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 =36 2009½×2009½-2008½×2008½ =(2009½+2008½)×(2009½-2008½) =4017 2/1×3+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 =22/23 2009/2010×2001=2009/2010+m 2009/2010×2001=(2009+2010m)/2010 2009×2001=2009+2010m 2010m=2009×2001-2009 2010m=2009×2000 m=4018/201