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2/1+6/1+12/1+20/1+30/1+42/1+56/1+72/1+90/1
1/2+1/
6
+1/12+1/20+1/30+1/42+1/56+1/72+1/90
简便计算
答:
1/2+1/6+1/
12+1/20+1/30+1/42+1/56+1/72+1
/90=1/(1*2)+1/(2*3)+1/(3*4)+1/(4*5)+1/(5*6)+1/(6*7)+1/(7*8)+1/(8*9)+1/(9*10)=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8+1/8-1/9+1/9-1/10=1-1/10=9...
1/2+1/
6
+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/
110=多少的简便运算_百 ...
答:
1/2+1/6+1/
12+1/20+1/30+1/42+1/56+1/72+1
/90简便运算怎么做 原式 =1/2+(1/2-1/3)+(1/3-1/4)+...+(1/8-1/9)+(1/9-1/10) =1/
2+1/
2-1/10 =9/10 把括号去掉,你就会发现前一项的后一部分和后一项的前一部分消掉, 最后就只有:1/2+1/2-...
1/2+1/
6
+1/12+1/20+1/30+1/42+1/56+1/72+1/90
简便运算怎么做_百度知 ...
答:
原式 =1/2+(1/2-1/3)+(1/3-1/4)+...+(1/8-1/9)+(1/9-1/10)=
1/2+1/2
-1/10 =9/10 把括号去掉,你就会发现前一项的后一部分和后一项的前一部分消掉,最后就只有:1/2+1/2-1/10=9/10 有不明白的地方再问哟,祝你学习进步,更上一层楼! (*^__^*)...
1/6
+1/12+1/20+1/30+1/42+1/56+1/72+1/90
简便计算
答:
1/2-1/3)+(1/3-1/4)+(1/4-1/5)+(1/5-1/6)+(1/6-1/7)+(1/7-1/8)+(1/8-1/9)+(1/9-1/10)=1/2-1/3
+1/
3-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8+1/8-1/9+1/9-1/10=1/2-1/10=2/5 ...
...方法计算
1/2+1/
6
+1/12+1/20+1/30+1/42+1/56+1/72
答:
原式=
1/2+1/2
-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8+1/8-1/9 =1-1/9 =8/9
计算
1/2+1/
6
+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/
110=?
答:
1/2+1/6+1/
12+1/20+1/30+1/42+1/56+1/72+1
/90+1/110 =1/1*2+1/2*3+……+1/10*11 =(1/1-1/2)+(1/2-1/3)+……+(1/10-1/11)=1/1-1/11 =10/11
1/2+1/
6
+1/12+1/20+1/30+1/42+1/56+1/72
怎么简便计算?
答:
您好,这道题需要把题中的分数分拆开来简便计算,具体计算过程见下图:
1/2+1/
6
+1/12+1/20+1/30+1/42+1/56+1/72+1/90
简算
答:
原式 =1/2+(1/2-1/3)+(1/3-1/4)+.+(1/8-1/9)+(1/9-1/10)=
1/2+1/2
-1/10 =9/10 把括号去掉,你就会发现前一项的后一部分和后一项的前一部分消掉,最后就只有:1/2+1/2-1/10=9/10
简便计算:
1+1
/2+1/6+1/
12+1/20+1/30+1/42+1/56+1/72+1
/
90
答:
1+1
/2+1/6+1/
12+1/20+1/30+1/42+1/56+1/72+1
/90 =1+1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8+1/8-1/9+1/9-1/10 =2-1/10 =1.9
...的数学题:
1/2+1/
6
+1/12+1/20+1/30+1/42+1/56+1/72
求简便方法_百度知 ...
答:
1/2+1/6
+1/12+1/20+1/30+1/42+1/56+1/72
把1/6项以后的各项都拆成两项,形成前后可以+-抵消的项,使计算简便 =1/2+(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+(1/5-1/6)+(1/6-1/7)+(1/7-1/8)+(1/8-1/9)=
1/2+1/2
-1/9 =1-1/9 =8/9 ...
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