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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
,(),(),()找规律
答:
1/2,1/6,
1/12
,
1/20
,
1/30
,
1/42
,(
1/56
),(
1/72
) ,(
1/90
)1/2=1/1*2 1/6=1/2*3 1/12=1/3*4 ...1/56=1/7*8 1/72=1/8*9 1/90=1/9*10
简算
1/2+1/
6
+1/12+1/20+1/30+1/42+1/56+1/72+1/90
。
答:
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)(中间的数两两正负抵消)=1-1/10 =9/10 ...
1/2+1/
6
+1/12+1/20+1/30+1/42+1/56+1/72+1/90
这道数学题的简便运算怎...
答:
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+...+1/8-1/9+1/9-1/10 =1-1/10 =9/10
1/2+1/
6
+1/12+1/20+1/30+1/42+1/56+1/72+1/90
的简便算法
答:
=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 =9/10 评论 求赞希望你有帮助 ...
1/2+1/
6
+1/12+1/20+1/30+1/42+1/56+1/72+1/90
怎么做 要简便计算_百度...
答:
分解:
1/2
=1-1/2 1/6=1/2-1/3
1/12
=1/3-1/4 ………
1/90
=1/9-1/10 则全加起来,等于1-1/10=0.9
计算1/2加1/6加
1/12
加
1/20
加
1/30
加
1/42
加
1/56
加
1/72
加
1/90
答:
回答:解原式=1-
1/2
十1/2-1/3十1/3-1/4……-1/9十1/9-1/10 =1-1/10 =9/10
1/2+1/
6
+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/
10 等于多少?〔要计算...
答:
满意请给分~~~
1/2+1/
6
+1/12+1/20+1/30+1/42+1/56+1/72+1/90+
...1/9900
答:
裂项法 原式=1-
1/2+1/2
-1/3+1/3-1/4+...+1/99-1/100 =1-1/100 =99/100
1/6
+1/12+1/20+1/30+1/42+1/56+1/72+1/90
简便计算
答:
1/6
+1/12+1/20+1/30+1/42+1/56+1/72+1/90
=1/2*3+1/3*4+..+1/9*10 =(1/2-1/3)+(1/3-1/4)+...+(1/9-1/10)=1/2-1/10 =2/5
1/2+1/
6
+1/12+1/20+1/30+1/42+1/56+1/72+1/90
=1怎么算简便?
答:
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+……1/9-1/10 (除了1与1/10,两两抵消)=1-1/10 =9/10 呵呵,加油!不懂再问,诚答!
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