奇迹世界2升级160 180:小学六年级数学计算?
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50/ (25/X+25/Y)==
=50/[25(x+y)/xy]
=(50xy)/[25(x+y)]
=(2xy)/(x+y)
2xy/(x+y)
12.5
12.5
2xy/(x+y)
=50/[25(x+y)/xy]
=(50xy)/[25(x+y)]
=(2xy)/(x+y)
2xy/(x+y)
12.5
12.5
2xy/(x+y)