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-(1/3-1/6+5/12)x2.4的差x5](/uploads/image/z/580295-47-5.jpg?t=%E8%AE%A1%E7%AE%97%EF%BC%9A1.%281-1%2F2%29x%281-1%2F3%29x%281-1%2F4%29x...x%281-1%2F2012%29+2.%28-5%29x%28-3%E5%8F%886%2F7%29%2B%28-7%29x%28-3%E5%8F%886%2F7%29-%28-12%29x%28-3%E5%8F%886%2F7%293.1%E5%8F%882%2F3-%281%2F3-1%2F6%2B5%2F12%29x2.4%E7%9A%84%E5%B7%AEx5)
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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-(1/3-1/6+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
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