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3/5 - 1,4 = 6/10 - 14/10= -8/10 = - 4/5
0,7 *7 1/7 = 7/10 *50/7 = 5
1 3/4 : (-14/10)= 7/4 :(-14/10) = 70/40 : (-56/40) =70/40 * (-56/40)= -49/20
10) -0,8
11) 5
12)-14 2
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