b

\(\dfrac{3}{7}:\dfrac{1}{5}+\dfrac{6}{7}:\dfrac{1}{5}-\dfrac{2}{7}:\dfrac{1}{5}\)

=\(\left(\dfrac{3}{7}+\dfrac{6}{7}-\dfrac{2}{7}\right):\dfrac{1}{5}\)

=1:\(\dfrac{1}{5}\)

=1x\(\dfrac{1}{5}\)

=\(\dfrac{1}{5}\)

Spam

53x128-43x128

=(53-43)x128

=10x128

=1280

c

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