Tính bằng cách thuận tiện:a) \(\frac{8}{5} \times \frac{{12}}{{17}} + \frac{{12}}{{17}} \times \frac{2}{5} -
Tính bằng cách thuận tiện:
a) \(\frac{8}{5} \times \frac{{12}}{{17}} + \frac{{12}}{{17}} \times \frac{2}{5} - \frac{{12}}{{17}}\)
b) \(\frac{6}{7} \times \frac{5}{{14}} + \frac{6}{7}:1\frac{5}{9}\)
Quảng cáo
a) \(\frac{8}{5} \times \frac{{12}}{{17}} + \frac{{12}}{{17}} \times \frac{2}{5} - \frac{{12}}{{17}} = \frac{{12}}{{17}} \times \left( {\frac{8}{5} + \frac{2}{5} - 1} \right) = \frac{{12}}{{17}} \times \left( {\frac{{10}}{5} - 1} \right) = \frac{{12}}{{17}} \times \left( {2 - 1} \right) = \frac{{12}}{{17}} \times 1 = \frac{{12}}{{17}}\)
b) \(\frac{6}{7} \times \frac{5}{{14}} + \frac{6}{7}:1\frac{5}{9} = \frac{6}{7} \times \frac{5}{{14}} + \frac{6}{7}:\frac{{14}}{9} = \frac{6}{7} \times \frac{5}{{14}} + \frac{6}{7} \times \frac{9}{{14}} = \frac{6}{7} \times \left( {\frac{5}{{14}} + \frac{9}{{14}}} \right) = \frac{6}{7} \times 1 = \frac{6}{7}\)
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