Tính hợp lý a) (9/16 + 8/-27) + (1 + 7/16 + -19/27) b) (13/5 7/16) - (15/16 - 6/15)
Giải thích
a)
916+8−27+1+716+−1927=916+8−27+1+716+−1927=916+716+−827+−1927+1=1+−1+1=1
b)
135+716−1516−615=135+716−1516+25=135+25+716−1516=3+−12=52
a)
916+8−27+1+716+−1927=916+8−27+1+716+−1927=916+716+−827+−1927+1=1+−1+1=1
b)
135+716−1516−615=135+716−1516+25=135+25+716−1516=3+−12=52