(1)-1/2-1/6-1/12-1/20-...-1/42
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(1)-1/2-1/6-1/12-1/20-...-1/42
(2)已知|a-1|+(b+2)^2=0,求(a+b)^1001的值
“^”代表次方
(2)已知|a-1|+(b+2)^2=0,求(a+b)^1001的值
“^”代表次方
![(1)-1/2-1/6-1/12-1/20-...-1/42](/uploads/image/z/17613244-28-4.jpg?t=%EF%BC%881%EF%BC%89-1%2F2-1%2F6-1%2F12-1%2F20-...-1%2F42)
(1)-1/2-1/6-1/12-1/20-...-1/42
=-(1/1*2+1/2*3+1/3*4+..+1/6*7)
=-(1-1/2+1/2-1/3+..+1/6-1/7)
=-(1-1/7)=-6/7
(2)已知|a-1|+(b+2)^2=0,求(a+b)^1001的值
|a-1|,(b+2)^2均为非负,现在和为0,则均为0
有a-1=0 a=1
b+2=0 b=-2
(a+b)^1001
=(-1)^1001
=-1
=-(1/1*2+1/2*3+1/3*4+..+1/6*7)
=-(1-1/2+1/2-1/3+..+1/6-1/7)
=-(1-1/7)=-6/7
(2)已知|a-1|+(b+2)^2=0,求(a+b)^1001的值
|a-1|,(b+2)^2均为非负,现在和为0,则均为0
有a-1=0 a=1
b+2=0 b=-2
(a+b)^1001
=(-1)^1001
=-1
简便运算:1/2+(-1/6)+(-1/12)+(-1/20)+(-1/30)+(-1/42)=?
1/2+1/6+1/12+1/20+1/30+1/42(简便运算)
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72
两个数学计算题(1)1/2+1/6+1/12+1/20+1/30+1+1/42+1/56+1/72+1/90(2)1/1
1/2+1/6+1/12+1\20+1/30+1/42+.+1/9900=?
1/2+1/6+1/12+1/20+1/30+1/42+1/56=?
1/2+1/6+1/12+1/20+1/30+1/42+1/56 简算
1/2+1/6+1/12+1/20+1/30+1/42+1/56
1+1/2+1/6+1/12+1/20+1/30+1/42的简便计算
2/1+6/1+12/1+20/1+30/1+42/1+56/1=
1/2-1/6-1/12-1/20-1/30-1/42-1/56等于多少
1/2+1/6+1/12+1/20+1/30+1/42+1/56简算,