8/1+24/1+48/1+80/1+120/1要过程
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1/8+1/24+1/48+1/80+1/120
=1/2X4+1/4X6+1/6X8+1/8X10+1/10X12
=1/2(1/2-1/4 +1/4+1/6 +...+1/10-1/12)
=1/2(1/2-1/12)
=5/24
=1/2X4+1/4X6+1/6X8+1/8X10+1/10X12
=1/2(1/2-1/4 +1/4+1/6 +...+1/10-1/12)
=1/2(1/2-1/12)
=5/24
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展开全部
1/8+1/24+1/48+1/80+1/120
=1/2x1/4+1/4x1/6+1/6x1/8+1/8x1/10+1/10x1/12
=1/2x(1/2-1/4 +1/4+1/6 +...+1/10-1/12)
=1/2x(1/2-1/12)
=5/24
=1/2x1/4+1/4x1/6+1/6x1/8+1/8x1/10+1/10x1/12
=1/2x(1/2-1/4 +1/4+1/6 +...+1/10-1/12)
=1/2x(1/2-1/12)
=5/24
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