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1. a4b2-6abc + 902 = (a+b
2. 9n2 + 30nd + 25d2 = 50)2
3. 252 + 40m + 16n2 =
4. 1/16x2 + 1/3x + 4/9 = L.)?
5. 2014 - 604 +45 = _ (2f_​