Tính nhanh: -3/7 +5/13 +3/7
Giải thích
a)−37+513+37=−37+37+513=513.
b)−521+−221+824=−521+−221+824=−13+13=0c)−511+−611+2=−511+−611+2=−1+2=1d)−132+12+−1532=−132+−1532+12=−12+12=0
a)−37+513+37=−37+37+513=513.
b)−521+−221+824=−521+−221+824=−13+13=0c)−511+−611+2=−511+−611+2=−1+2=1d)−132+12+−1532=−132+−1532+12=−12+12=0