1*(2*3)/(3*4)*(4*5)/(5*6)*……*(2008*2009)/(2009*2010)等于?
来源:学生作业帮助网 编辑:六六作业网 时间:2024/12/25 13:47:43
1*(2*3)/(3*4)*(4*5)/(5*6)*……*(2008*2009)/(2009*2010)等于?1*(2*3)/(3*4)*(4*5)/(5*6)*……*(2008*2009)/(200
1*(2*3)/(3*4)*(4*5)/(5*6)*……*(2008*2009)/(2009*2010)等于?
1*(2*3)/(3*4)*(4*5)/(5*6)*……*(2008*2009)/(2009*2010)等于?
1*(2*3)/(3*4)*(4*5)/(5*6)*……*(2008*2009)/(2009*2010)等于?
2/2010=1/1005
第一项是1不管,后面每一项的分母与下一项的分子约分
只剩下第2项的分子2,和最后一项的分母2010
(1) (2) (3) (4) (5)
1)2)3)4)5)
1) 2) 3) 4) 5)
0-(+2/1)-(+5/2)-(-4/3)-(+4/1)-(-5/3)
-1-(-2)-(+3)+(-4)-(-5)
(1-2)(1-3)(3-4)(4-5)...(19-20)=
5/9+(3/4-1/2)
4/5+(3/8-1/2)
(1/3+2/3)+(1/4+2/4+3/4)+(1/5+2/5+3/5+4/5)+.+(1/100+.99/100)=
(4/5+1/4)÷2/3+3/10
1/2+(-2/3)-(-4/5)+(-1/2)-(+1/3)
2/3,1,6/5,4/3,( ),3/2
(2*3*4*5)*(1/2-1/3-1/4-1/5)
-3²×(-3)² (-1/2)×(-2/3)×(-3/4)×(-4/5)-3²×(-3)² (-1/2)×(-2/3)×(-3/4)×(-4/5)
4×(-1/2²)-3/2×(-2/5)
(1-3/2*4)*(1-3/3*5)*...*(1-3/7*9)
(-1)*(-2)*(-3)+(-2)*(-3)*(-4)+(-3)*(-4)*(-5)+~+(-100)*(-101)*(-102)
1()2()3()4