a- 1256*(5-4)+1256=1256+1256=2512
b-= 2/3
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\(a.1256\times5-4\times1256+1256\)
\(=1256\times5-4\times1256+1256\times1\)
\(=1256\times\left(5-4+1\right)\)
\(=1256\times2\)
\(=2512\)
\(b.\dfrac{2}{3}\div\dfrac{6}{2}+\dfrac{2}{3}\div\dfrac{6}{3}+\dfrac{2}{3}\div6\)
\(=\dfrac{2}{3}\times\dfrac{2}{6}+\dfrac{2}{3}\times\dfrac{3}{6}+\dfrac{2}{3}\times\dfrac{1}{6}\)
\(=\dfrac{2}{3}\times\left(\dfrac{2}{6}+\dfrac{3}{6}+\dfrac{1}{6}\right)\)
\(=\dfrac{2}{3}\times1\)
\(=\dfrac{2}{3}\)
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