(12,3+3 3/4) * 0,5=(12 3/10+3 3/4)*0,5=(12 12/40+3 30/40)*0,5=15 42/40 * 5/10 = 642/40*5/10=3210/400=321/40=8 1/40
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(12,3+3 3/4) * 0,5=(12 3/10+3 3/4)*0,5=(12 12/40+3 30/40)*0,5=15 42/40 * 5/10 = 642/40*5/10=3210/400=321/40=8 1/40