【(1+1/7)-(-3)+(-1/5)】/(-1/105)

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【(1+1/7)-(-3)+(-1/5)】/(-1/105)【(1+1/7)-(-3)+(-1/5)】/(-1/105)【(1+1/7)-(-3)+(-1/5)】/(-1/105)干什么?计算吗?[(

【(1+1/7)-(-3)+(-1/5)】/(-1/105)
【(1+1/7)-(-3)+(-1/5)】/(-1/105)

【(1+1/7)-(-3)+(-1/5)】/(-1/105)
干什么?计算吗?
[(1+1/7)-(-3)+(-1/5)]/(-1/105)
=(1+1/7+3-1/5)×(-105)
=(35/35+5/35+105/35-7/35)×(-105)
=(138/35)×(-105)
=(138)×(-3)
=-414

简便运算 (1+1/3+1/5+1/7)*(1/3+1/5+1/7+1/9)-(1+1/3+1/5+1/7+1/7+1/9)*(1/3+1/5+1/7) 算术题,(1+1/3+1/5+1/7)×(1/3+1/5+1/7+1/9)-(1+1/3+1/5+1/7+1/9)×(1/3+1/5+1/7) 数奥题(1+1/3+1/5+1/7)*(1/3+1/5+1/7+1/9)-(1+1/3+1/5+1/7+1/9)*(1/3+1/5+1/7)求(1+1/3+1/5+1/7)*(1/3+1/5+1/7+1/9)-(1+1/3+1/5+1/7+1/9)*(1/3+1/5+1/7)的简便算法要求: 【(1+1/7)-(-3)+(-1/5)】/(-1/105) (-5)*(+7 1/3)+(+7)*(-7 1/3)-(+12)*7 1/3 简便方法计算 一道数学题:1/(1*3) + 1/(3*5) +1/(5*7)+ …… 1/(2009*2011)= 1/(1*3) + 1/(3*5) +1/(5*7)+ …… 1/(2009*2011)= (1-3/2*4)*(1-3/3*5)*...*(1-3/7*9) 数学题 1/(1*3)+1/(3*5)+1/(5*7)+.+1/(2007*2009) 计算(1/1*3)+(1/3*5)+(1/5*7)+……+(1/19*21) 】 1/(1*3)+1/(3*5)+1/(5*7)+.+1/(49+51)的简便运算 1/1*3=1/2(1-1/3)1/3*5=1/2(1/3-1/5)1/5*7=1/2(1/5-1/7).1/17*19=1/2(1/17-1/19)所以1/1*3+1/3*5+1/5*7+.1/17*19=1/2(1-1/3)+1/2(1/3+1/5)+1/2(1/5-1/7)+.1/2(1/17-1/19)=1/2(1-1/3+1/3-1/5+1/5-1/7+1/7.+1/17-1/19)=1/2(1-1/1 1/(1*3*5)+1/(3*5*7)+1/(5*7*9)+1/(7*9*11).+(25*27*29) (1)1/5(x+15)=1/2-1/3(x-7) 1/(1×3×5)+1/(3×5×7)+1/(5×7×9)+1/(7×9×11)+...+1/(2001×2003×2005)=? 找规律:1/3,2/5,1/7(),1/11,() 1/2,(),1/8,1/16,() (1+1/2)*(1+1/4)*(1+1/6)*...*(1+1/2008)*(1-1/3)*(1-1/5)*(1-1/7)*...*(1-1/2007) 简便计算:1、1/3+1/6+1/10+1/15+1/21+1/28+.+1/1202、1/4+1/12+1/24+1/40+.+1/198003、1+1/(1+2)+1/(1+2+3)+1/(1+2+3+4)+.+1/(1+2+3+4+.+50)4、(3*3-1)/(3*3+1)+(5*5-1)/(5*5+1)+(7*7-1)/(7*7+1)+.+(1995*1995-1 简算 (2+3+1/5)+(2/3-5/17)-(1/5+12/7)