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b)78 1/7 : 1 11/14 - 1 2/5 * 15/28 = 50/7 : 25/14 - 7/5 * 15/28 = 50/7 * 14/25 - 3/4 = 4- 3/4= 3 1/4
b)7 1/7 : 1 11/14-1 2/5 * 15/28=50/7*14/25-196/140*75/140=4/1-105/140=560/140-105/140=455/140=3 1/4
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