1/2X4+1/4X6+1/6X8+.+1/198X200要过程加答案(或者直接答案)
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1/2X4+1/4X6+1/6X8+.+1/198X200要过程加答案(或者直接答案)
1/2X4+1/4X6+1/6X8+.+1/198X200要过程加答案(或者直接答案)
1/2X4+1/4X6+1/6X8+.+1/198X200要过程加答案(或者直接答案)
1/2×4+1/4×6+1/6×8+.+1/198×200
=(1/2)(1/2-1/4+1/4-1/6+1/6-1/8+...+1/198-1/200)
=(1/2)(1/2-1/200)
=(1/2)(99/200)
=99/400