Calculați:
5supra8•3supra7•4supra9
1supra9•2supra5•18supra7
2supra7•3supra10•14supra10
2 1 supra2•3supra5•1supra2
4•3supra7•2 1supra3 5•3 1supra4•5supra8
2 1supra3•3 1supra2•4
1supra5•2 1supra2•3​