Question

Answer 1

B1:

   -1,205 ; -0,012 ; -15,10  ;12,5

Answer 2

Bài 2:

a,\(\dfrac{25}{23}-\dfrac{-4}{23}=\dfrac{25-\left(-4\right)}{23}=\dfrac{29}{23}\)

b,\(5\dfrac{3}{7}+3\dfrac{2}{7}=\dfrac{38}{7}+\dfrac{23}{7}=\dfrac{38+23}{7}=\dfrac{61}{7}\)

c,\(\dfrac{25}{14}+\left(\dfrac{-2}{11}+\dfrac{-25}{14}\right)=\left(\dfrac{25}{14}+\dfrac{-25}{14}\right)-\dfrac{-2}{11}=\left(\dfrac{25+\left(-25\right)}{14}\right)-\dfrac{-2}{11}=0-\dfrac{-2}{11}=\dfrac{2}{11}\)