计算:1.(1-1/2)x(1-1/3)x(1-1/4)x...x(1-1/2012) 2.(-5)x(-3又6/7)+(-7)x(-3又6/7)-(-12)x(-3又6/7)3.1又2/3-(1/3-1/6+5/12)x2.4的差x5

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计算:1.(1-1/2)x(1-1/3)x(1-1/4)x...x(1-1/2012)2.(-5)x(-3又6/7)+(-7)x(-3又6/7)-(-12)x(-3又6/7)3.1又2/3-(1/3-

计算:1.(1-1/2)x(1-1/3)x(1-1/4)x...x(1-1/2012) 2.(-5)x(-3又6/7)+(-7)x(-3又6/7)-(-12)x(-3又6/7)3.1又2/3-(1/3-1/6+5/12)x2.4的差x5
计算:1.(1-1/2)x(1-1/3)x(1-1/4)x...x(1-1/2012) 2.(-5)x(-3又6/7)+(-7)x(-3又6/7)-(-12)x(-3又6/7)
3.1又2/3-(1/3-1/6+5/12)x2.4的差x5

计算:1.(1-1/2)x(1-1/3)x(1-1/4)x...x(1-1/2012) 2.(-5)x(-3又6/7)+(-7)x(-3又6/7)-(-12)x(-3又6/7)3.1又2/3-(1/3-1/6+5/12)x2.4的差x5
1' 原式等于1/2*2/3*3/4*4/5*……*2011/2012,前项的分母和后项的分子约分后等于1/2012

2, 等于0,{(-5)+(-7)-(-12)}x(-3又6/7)=0*x(-3又6/7)=0