Tính: a) -1 2/3 + 3/4 - 1/2 + 2 1/6 b) -1 + 1/3 -1/9 + 1/27 - 1/81
Giải thích
a) −123+34−12+216=−53+34−12+136=−2012+912−612+2612=34
b) −1+13−19+127−181=−8181+2781−981+381−181=−6181
a) −123+34−12+216=−53+34−12+136=−2012+912−612+2612=34
b) −1+13−19+127−181=−8181+2781−981+381−181=−6181