\(71\dfrac{38}{45}-\left(43\dfrac{8}{45}-1\dfrac{17}{57}\right)\)
\(=71\dfrac{38}{45}-43\dfrac{8}{45}+1\dfrac{17}{57}\)
\(=28\dfrac{2}{3}+1\dfrac{17}{57}=\dfrac{86}{3}+\dfrac{74}{47}=\dfrac{1708}{57}\)
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\(B=71\dfrac{38}{45}-\left(43\dfrac{8}{45}-1\dfrac{17}{57}\right)\)
\(B=71\dfrac{38}{45}-43\dfrac{8}{45}+1\dfrac{17}{57}\)
\(B=\left(71\dfrac{38}{45}-43\dfrac{8}{45}\right)+1\dfrac{17}{57}\)
\(B=28\dfrac{2}{3}+1\dfrac{17}{57}\)
\(B=29\dfrac{55}{57}\)
\(71\dfrac{38}{45}-\left(43\dfrac{8}{45}-1\dfrac{17}{57}\right)\\ =71\dfrac{38}{45}-43\dfrac{8}{45}+1\dfrac{17}{57}\\ =\left(71\dfrac{38}{45}-43\dfrac{8}{45}\right)+1\dfrac{17}{57}\\ =28\dfrac{2}{3}+1\dfrac{17}{57}\\ =\dfrac{86}{3}+\dfrac{74}{57}\\ =\dfrac{1708}{57}\)