(-5 a3)•(2b2-3b2)-(2a3-4a3)•(3b2)=
Deve essere questo il risultato
https://www.wolframalpha.com/input?i=%28-5+a3%29%E2%80%A2%282b2-3b2%29-%282a3-4a3%29%E2%80%A2%283b2%29%3D
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