Question

cho mik đáp án chi tiết ạ  

Answer 1

a: \(38\cdot76-38\cdot\left(-62\right)-\left(-38\right)^2\)

\(=38\cdot76+38\cdot62-38^2\)

\(=38\left(76+62-38\right)\)

\(=38\cdot100=3800\)

b: \(\left(-43-2265\right)-\left(157-3265\right)\)

\(=-43-2265-157+3265\)

\(=\left(-43-157\right)+\left(3265-2265\right)\)

=1000-200

=800

c: \(\dfrac{-5}{12}+\dfrac{3}{8}-\dfrac{5}{6}\)

\(=\dfrac{-10+9-20}{24}\)

\(=\dfrac{-21}{24}=\dfrac{-7}{8}\)