\(a,\dfrac{-2}{7}-0,34+\dfrac{-5}{7}-0,66\)
\(=\left(\dfrac{-2}{7}+\dfrac{-5}{7}\right)+\left[\left(-0,34\right)+\left(-0,66\right)\right]\)
\(=-1+\left(-1\right)\)
\(=-2\)
\(b,1,8\cdot\dfrac{1}{3}-3,8+1,8\cdot\dfrac{2}{3}\)
\(=1,8\cdot\left(\dfrac{1}{3}+\dfrac{2}{3}\right)-3,8\)
\(=1,8\cdot\dfrac{3}{3}-3,8\)
\(=1,8-3,8\)
\(=-2\)
#Urushi
Đúng 1
Bình luận (0)