Corretto: 2×7=14, 10×4=40, 3×3=9, 3+22=25, 32+4=36, 43+6=49, 33-3=30, 45-32=13, 21-3=18, Errato: 2×7=75, 3+22=28, 3×3=24, 10×4=470, 32+4=45, 43+6=22, 33-3=32, 45-32=100, 21-3=222 ,

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