Simplify
1.53 + 4.73 + 3.83 - 3 x 1.5 x 4.7 x 3.81.52 + 4.72 + 3.82 - 1.5 x 4.7 - 4.7 x 3.8 - 1.5 x 3.8
Apply a3 + b3 + c3 - 3abca2 + b2 + c2 - ab - bc - ca = a + b + c
Hence the answer is 1.5 + 4.7 + 3.8 = 10.
If a - b = 5 and a2 + b2 = 97, ab = ?
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