简便算法(1*2)/1+(2*3)/1+(3*4)/1.(49*50)/1(一定要简便)

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简便算法(1*2)/1+(2*3)/1+(3*4)/1.(49*50)/1(一定要简便)
简便算法(1*2)/1+(2*3)/1+(3*4)/1.(49*50)/1(一定要简便)

简便算法(1*2)/1+(2*3)/1+(3*4)/1.(49*50)/1(一定要简便)
(1*2)/1+(2*3)/1+(3*4)/1.(49*50)/1
=1-1/2+1/2-1/3+1/3-1/4+...-1/49+1/50
=1-1/50=49/50

(1*2)/1+(2*3)/1+(3*4)/1......(49*50)/1
=1-1/2+1/2-1/3+1/3-1/4+……+1/49-1/50
=1-1/50
=49/50
=0.98

这丫头光整简便算法了~~~好好学吧