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2. 2/7 x0,5 => 2/7 x 5/10 => 2x5/7x10 => 10/70 => 1/7
3. 0,81 x 0,9 => 81/100 x 90/100 => 90x81/100x100 => 7290/10000
=> 729/1000 => 0,729
2) 0,285714 x 0,5 = 0,142857
3) 0,81 x 0,9 = 0,729