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Google  Google help
Rank Domain PR Backlinks Pages in URL
1cut-the-knot.org63080037000
3freepatentsonline.com79130012500000
5qbyte.org63220546
7jd2718.wordpress.com5235003330
9geocities.com92120000010200000
10olimu.com564702150
11maa.org87460036300
12cs.purdue.edu74090032100
14theory.stanford.edu679305020
15illuminations.nctm.org6375002460


Yahoo  Yahoo help
Rank Domain PR Backlinks Pages in URL
1dictionary.reference.com822700005910000
2cut-the-knot.org63080037000
4qbyte.org63220546
5demonstrations.wolfram.com75480015100
6armoredpenguin.com435008960
7discoverspace.org47889
9euler.slu.edu543902870
11humboldt.edu77750086200
12fastgeometry.com42313
13cs.purdue.edu74090032100


Bing  Bing help
Rank Domain PR Backlinks Pages in URL
1cut-the-knot.org63080037000
3origomath.com389222
4edhelper.com64100035900
5mathsisfun.com6182007320
6demonstrations.wolfram.com75480015100
7qbyte.org63220546
9geocities.com92120000010200000
10wordassociates.com23827
11mathforum.org8115000375000
12trincoll.edu77590029900


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