1 1/5 * 2 + 4/5 * 3 = 4/5 * ( 6/4 * 2 + 3 ) = 4/5 * ( 3 + 3 ) = 24/5 = 4 4/5 = 4,8
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2 4/5 * 3 - 4/5 * 3 = 3 * ( 2 4/5 - 4/5 ) = 3 * 2 = 6
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2 4/5 * 5/9 + 6 1/5 * 5/9 = 5/9 * ( 2 4/5 + 6 1/5 ) = 5/9 * 9 = 5
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2 4/5 * 5/8 = 14/5 * 5/8 = 14/8 = 7/4 = 1 3/4 = 1,75
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3 1/5 * 8/11 + 3 1/5 * 3/11 = 3 1/5 * ( 8/11+ 3/11 ) = 3 1/5 * 1 = 3 1/5
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4 2/3 * 7 1/12 - 6 1/12 * 4 2/3 = 4 2/3 * ( 7 1/12 - 6 1/12 ) = 4 2/3 * 1 = 4 2/3