观察下列等式:1*1/2=1-1/2,2*2/3=2-2/3,3*3/4=3-3/4,……请你计算(1-1/2)/10 x (2-2/3)/9 x (3-3/4)/8打错了,是请你计算(1-1/2)/10 x (2-2/3)/9 x (3-3/4)/8 x ……x(10-10/11)/1
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观察下列等式:1*1/2=1-1/2,2*2/3=2-2/3,3*3/4=3-3/4,……请你计算(1-1/2)/10 x (2-2/3)/9 x (3-3/4)/8打错了,是请你计算(1-1/2)/10 x (2-2/3)/9 x (3-3/4)/8 x ……x(10-10/11)/1
观察下列等式:1*1/2=1-1/2,2*2/3=2-2/3,3*3/4=3-3/4,……请你计算(1-1/2)/10 x (2-2/3)/9 x (3-3/4)/8
打错了,是请你计算(1-1/2)/10 x (2-2/3)/9 x (3-3/4)/8 x ……x(10-10/11)/1
观察下列等式:1*1/2=1-1/2,2*2/3=2-2/3,3*3/4=3-3/4,……请你计算(1-1/2)/10 x (2-2/3)/9 x (3-3/4)/8打错了,是请你计算(1-1/2)/10 x (2-2/3)/9 x (3-3/4)/8 x ……x(10-10/11)/1
关键在于逆应用条件1*1/2=1-1/2,2*2/3=2-2/3,3*3/4=3-3/4,由题意得
(1-1/2)/10 x (2-2/3)/9 x (3-3/4)/8 x ……x(10-10/11)/1
=(1x1/2x1/10)x(2x2/3x1/9)x(3x3/4x1/8)x.x(8x8/9x1/3)x(9x9/10x1/2)x(10x10/11x1/1)(整理简化运算)
=(1x2x3x...x10)x(1/10x1/9x1/8x1/7x.x1/2x1/1)x(1/2x2/3x3/4x.x8/9x9/10x10/11)
=1/11
给点分吧!
1/60
算到一半晕了。。。
关键在于逆应用条件1*1/2=1-1/2,2*2/3=2-2/3,3*3/4=3-3/4,由题意得
(1-1/2)/10 x (2-2/3)/9 x (3-3/4)/8 x ……x(10-10/11)/1
=(1x1/2x1/10)x(2x2/3x1/9)x(3x3/4x1/8)x....x(8x8/9x1/3)x(9x9/10x1/2)x(10x10/11x1/1)(整理简化运算...
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关键在于逆应用条件1*1/2=1-1/2,2*2/3=2-2/3,3*3/4=3-3/4,由题意得
(1-1/2)/10 x (2-2/3)/9 x (3-3/4)/8 x ……x(10-10/11)/1
=(1x1/2x1/10)x(2x2/3x1/9)x(3x3/4x1/8)x....x(8x8/9x1/3)x(9x9/10x1/2)x(10x10/11x1/1)(整理简化运算)
=(1x2x3x...x10)x(1/10x1/9x1/8x1/7x....x1/2x1/1)x(1/2x2/3x3/4x.....x8/9x9/10x10/11)
=1/11
收起