Question

tính hợp lý :

a, \(A=5\dfrac{4}{23}.27\dfrac{3}{47}+5\dfrac{4}{23}.\left(-4\dfrac{3}{47}\right)\)

b, \(B=2^3+3.1-2^{-2}.4+\left(-2^2:\dfrac{1}{2}\right).8\)

Answer 1

\(a.\)

\(A=5\dfrac{4}{23}.27\dfrac{3}{47}+5\dfrac{4}{23}.\left(-4\dfrac{3}{47}\right)\)

\(A=5\dfrac{4}{23}\left(27\dfrac{3}{47}-4\dfrac{3}{47}\right)\)

\(A=5\dfrac{4}{23}\left(27-4\right)\)

\(A=5\dfrac{4}{23}.23\)

\(A=119\)

\(b.\)

\(B=2^3+3.1-2^{-2}.4+\left(-2^2:\dfrac{1}{2}\right).8\)

\(B=2^3+3-\dfrac{1}{4}.4+\left(-8\right).8\)

\(B=2^3+3-1-64\)

\(B=-54\)