Lời giải:
Báo sai\(\frac{{ - 15}}{7}:\frac{5}{{14}} = \frac{{ - 15}}{7}.\frac{{14}}{5} = \frac{{\left( { - 15} \right).14}}{{7.5}} = \frac{{\left( { - 3} \right).\not{5}.2.\not{7}}}{{\not{7}.\not{5}}} = \left( { - 3} \right).2 = - 6\)
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