已知1x2/1=1-2/1,2x3/1=2/1-3/1 ,3x4/1=3/1-4/1 ,4x5/1=4/1-5/1计算5x6/1+6x7/1+7x8/1+8x9/1...+47x48/1+48x49/1+49x50/1

已知1x2/1=1-2/1,2x3/1=2/1-3/1 ,3x4/1=3/1-4/1 ,4x5/1=4/1-5/1计算5x6/1+6x7/1+7x8/1+8x9/1...+47x48/1+48x49/1+49x50/1
已知1x2/1=1-2/1,2x3/1=2/1-3/1 ,3x4/1=3/1-4/1 ,4x5/1=4/1-5/1
计算5x6/1+6x7/1+7x8/1+8x9/1...+47x48/1+48x49/1+49x50/1

已知1x2/1=1-2/1,2x3/1=2/1-3/1 ,3x4/1=3/1-4/1 ,4x5/1=4/1-5/1计算5x6/1+6x7/1+7x8/1+8x9/1...+47x48/1+48x49/1+49x50/1
题目中你的分数的书写,分子分母的位置应该换一下.=1/5-1/6+1/6-1/7+1/7-1/8……+1/48-1/48+1/49-1/50=1/5-1/50=9/50