Chử YếnTa có:
[imath]D = 1 \dfrac{3}{8} + \dfrac{1}{8} ÷ \left( 0,75 - \dfrac{1}{2} \right) -25% . \dfrac{1}{2}[/imath]
[imath]D = \dfrac{11}{8} + \dfrac{1}{8}÷ \dfrac{1}{4} - \dfrac{1}{4}.\dfrac{1}{2} = \dfrac{11}{8} + \dfrac{1}{2} - \dfrac{1}{8} = \dfrac{7}{4}[/imath]
[imath]E = \left ( -\dfrac{1}{2}\right)^2 - (-2)^2 -5^0[/imath]
[imath]E = \dfrac{1}{4} - 4 -1 = \dfrac{-19}{4}[/imath]
[imath]F = 12 \dfrac{1}{3} - \dfrac{5}{7} ÷ \left( 24 - 23 \dfrac{5}{7} \right)[/imath]
[imath]F = \dfrac{37}{3} - \dfrac{5}{7} . \dfrac{7}{2} = \dfrac{59}{6}[/imath]
Ngoài ra mời bạn tham khảo: Tổng hợp kiến thức toán 6