Tính: a) A = 5/11 . (-3/23). 11/5 . (-4,6); b) B = (-7/9) . 13/25 - 13/25 . 2/9
Giải thích
a)
A=511⋅−323⋅115⋅(−4,6)=511⋅−323⋅115⋅−4610=511⋅115⋅−323⋅−4610=1.−323⋅−235=−3.(−23)23.5=35
b)
B=−79⋅1325−1325⋅29=1325⋅−79−29=1325⋅(−1)=−1325
a)
A=511⋅−323⋅115⋅(−4,6)=511⋅−323⋅115⋅−4610=511⋅115⋅−323⋅−4610=1.−323⋅−235=−3.(−23)23.5=35
b)
B=−79⋅1325−1325⋅29=1325⋅−79−29=1325⋅(−1)=−1325