Jawabanmu

2014-03-28T20:57:29+07:00
1 + 1 = 10
x    y
y+x = 10
 xy
40 = 10
xy
xy= 40
      10
xy= 4
2014-03-28T21:03:12+07:00
1/x + 1/y = 10 (perkalian silang)
y+x per xy = 10
40/xy= 10
40/10 = xy
xy = 4