1/2+1/6+1/12+1/20+1/30 1/2000+2/2000+3/2000+4/2000+……+2000/2000甲.乙两数的和是496.甲数小数点向右移动一位就等于乙数,甲数是?
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![1/2+1/6+1/12+1/20+1/30 1/2000+2/2000+3/2000+4/2000+……+2000/2000甲.乙两数的和是496.甲数小数点向右移动一位就等于乙数,甲数是?](/uploads/image/z/2700652-4-2.jpg?t=1%2F2%2B1%2F6%2B1%2F12%2B1%2F20%2B1%2F30+1%2F2000%2B2%2F2000%2B3%2F2000%2B4%2F2000%2B%E2%80%A6%E2%80%A6%2B2000%2F2000%E7%94%B2.%E4%B9%99%E4%B8%A4%E6%95%B0%E7%9A%84%E5%92%8C%E6%98%AF496.%E7%94%B2%E6%95%B0%E5%B0%8F%E6%95%B0%E7%82%B9%E5%90%91%E5%8F%B3%E7%A7%BB%E5%8A%A8%E4%B8%80%E4%BD%8D%E5%B0%B1%E7%AD%89%E4%BA%8E%E4%B9%99%E6%95%B0%EF%BC%8C%E7%94%B2%E6%95%B0%E6%98%AF%EF%BC%9F)
1/2+1/6+1/12+1/20+1/30 1/2000+2/2000+3/2000+4/2000+……+2000/2000甲.乙两数的和是496.甲数小数点向右移动一位就等于乙数,甲数是?
1/2+1/6+1/12+1/20+1/30
1/2000+2/2000+3/2000+4/2000+……+2000/2000
甲.乙两数的和是496.甲数小数点向右移动一位就等于乙数,甲数是?
1/2+1/6+1/12+1/20+1/30 1/2000+2/2000+3/2000+4/2000+……+2000/2000甲.乙两数的和是496.甲数小数点向右移动一位就等于乙数,甲数是?
原式=1/2+(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+(1/5-1/6)=5/6
原式=(1+2+3+4+……+2000)/2000=[(1+2000)*2000/2]/2000=2001/2
甲数=(496.1/11)=45.1
1.原式=1/2+1/6+1/12+1/12
=1/2+1/6+1/6
=1/2+1/3
=5/6
2.原式=(1+2+3+……+2000)/2000
=2000(1+2000)/2/2000
=2001/2
1、1/2+1/6+1/12+1/20+1/30 =1/1*2+1/2*3+1/3*4+1/5*6=(2-1)/1*2+(3-2)/2*3+(4-3)/4*3+(5-4)/4*5+(6-5)/5*6=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6=5/6
2、1/2000+2/2000+3/2000+4/2000+……+2000/2000 =(1+2+3+...+2000)/2000={(1+2000)*2000/2}/2000=1000.5
我靠,这是小学五年级的题目?牛X,我记得我是初中才学的。。。
现在小孩子真苦啊。。智力跟不上就吊了
1/2+1/6+1/12+1/20+1/30
=(1-1/2)+(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+(1/5-1/6)
=1-1/6=5/6
1/2000+2/2000+3/2000+4/2000+……+2000/2000
=(1+2+3+...+2000)/2000
=(1+2000+2+1999+3+1998+...+1000+1001)/2000
=2001*1000/2000
=2001*1/2
=2001/2
1.原式=1/2+1/6+1/12+1/12
=1/2+1/6+1/6
=1/2+1/3
=5/6
2.原式=(1+2+3+……+2000)/2000
=2000(1+2000)/2/2000
=2001/2