简算:2/2x4+2/4x6+2/6x8+……+2/98xl00

问题描述:

简算:2/2x4+2/4x6+2/6x8+……+2/98xl00
要过程

2/2x4+2/4x6+2/6x8+……+2/98xl00
=1/2-1/4+1/4-1/6+……+1/98-1/100
=1/2-1/100
=49/100