1/1X2X3+1/2X3x4+…+1/48X49X50
=（1/1X2-1/2X3+1/2X3-1/3x4+…+1/48X49-1/49X50）÷2
= （1/1X2-1/49X50）÷2
=（1/2-1/2450）÷2
=1224/2450÷2
=306/1225
1/1X2X3+1/2X3x4+…+1/48X49X50
2个回答
相关问题
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计算1x2x3+2x3x4+…+48x49x50
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1\1x2x3+1\2x3x4+1\3x4x5+``````+1\48x49x50注：(\)为分数线(x)为乘号
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1/2x4 +1/2x3 +1/3x4 +.+1/49x50
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1/1x2+1/2x3+1/3x4.1/49x50
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1x2\1+2x3\1+3x4\1+.+49x50\1
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1/1x2+1/2x3+1/3x4+1/4x5+.1/49x50
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5/1X2+5/2X3+5/3X4+5/4X5.+5/48X49+5/49X50=?
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2x1/3+3x1/4+4x1/5+````````+49x1/50等于多少?
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1X2/1+2x3/1+……+49x50/1
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49(x^2+1)=50 x=?(3x-1)^2=25 x=?