Tính: a) (-2/3 + 3/7) : 4/5 + ( -1/3 + 4/7) : 4/5
Giải thích
a) −23+37:45+−13+47:45= −23+37.54+−13+47.54
= −23+37+−13+47.54 = −23+−13+37+47.54
= −33+77.54=−1+1.54=0.54=0
a) −23+37:45+−13+47:45= −23+37.54+−13+47.54
= −23+37+−13+47.54 = −23+−13+37+47.54
= −33+77.54=−1+1.54=0.54=0