Tính giá trị biểu thức 35 x 12 + 63 x
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\(\dfrac{3}{5}:\left(-\dfrac{1}{15}-\dfrac{1}{6}\right)+\dfrac{3}{5}:\left(-\dfrac{1}{3}-1\dfrac{1}{15}\right)\)
\(=\dfrac{3}{5}:\left(-\dfrac{2}{30}-\dfrac{5}{30}\right)+\dfrac{3}{5}:\left(-\dfrac{1}{3}-\dfrac{16}{15}\right)\)
\(=\dfrac{3}{5}:\left(-\dfrac{7}{30}\right)+\dfrac{3}{5}:\left(-\dfrac{7}{5}\right)\)
\(=\dfrac{3}{5}.\left[\left(-\dfrac{30}{7}\right)+\left(-\dfrac{5}{7}\right)\right]\)
\(=\dfrac{3}{5}.-5\)
\(=-3\)
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\(16\dfrac{2}{7}:-\dfrac{3}{5}+28\dfrac{2}{7}:\dfrac{3}{5}\)
\(=16\dfrac{2}{7}.-\dfrac{5}{3}+28\dfrac{2}{7}.\dfrac{5}{3}\)
\(=-16\dfrac{2}{7}.\dfrac{5}{3}+28\dfrac{2}{7}.\dfrac{5}{3}\)
\(=\dfrac{5}{3}.\left(-16\dfrac{2}{7}+28\dfrac{2}{7}\right)\)
\(=\dfrac{5}{3}.12\)
\(=20\)
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\(\left(\dfrac{2}{3}+\dfrac{1}{5}-\dfrac{4}{9}\right):\left(\dfrac{1}{3}+\dfrac{2}{5}-\dfrac{6}{9}\right)\)
\(=\left(\dfrac{30}{45}+\dfrac{9}{45}-\dfrac{20}{45}\right):\left(\dfrac{15}{45}+\dfrac{18}{45}-\dfrac{30}{45}\right)\)
\(=\dfrac{19}{45}:\dfrac{1}{15}\)
\(=\dfrac{19}{3}\)
35 x 12 + 63
= 420 + 63
= 483
35 x 12 + 63
= 420 + 63
= 483