展开全部
2/2x4+2/4x6+2/6x8+...+2/98x100
=1/2(1/2+1/zx3+1/3x4+...1/49x50)
=1/2(1-1/2+1/2-1/3+1/3-1/4+..+1/49-1/50)
=1/2(1-1/50)
=49/100
=1/2(1/2+1/zx3+1/3x4+...1/49x50)
=1/2(1-1/2+1/2-1/3+1/3-1/4+..+1/49-1/50)
=1/2(1-1/50)
=49/100
展开全部
2/2x4+2/4x6+2/6x8+...+2/98x100
=1/2-1/4+1/4-1/6+1/6-1/8+…………+1/98-1/100
=1/2-1/100
=49/100
=1/2-1/4+1/4-1/6+1/6-1/8+…………+1/98-1/100
=1/2-1/100
=49/100
展开全部
2/2*4= 1/2-1/4
2/2x4+2/4x6+2/6x8+...+2/98x100
=1/2-1/4+1/4-1/6+...+1/98-1/100
=1/2-1/100
=49/100
2/2x4+2/4x6+2/6x8+...+2/98x100
=1/2-1/4+1/4-1/6+...+1/98-1/100
=1/2-1/100
=49/100
展开全部
2/2x4+2/4x6+2/6x8+...+2/98x100
=2*(1/2-1/4+1/4-1/6+...1/98-1/100)
=2*(1/2-1/100)
=49/50
=2*(1/2-1/4+1/4-1/6+...1/98-1/100)
=2*(1/2-1/100)
=49/50
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