Đáp án+Giải thích các bước giải:
ta có:
72^45-72^44
72.72^44−72^44=72^44(72−1)=72^44.71.
72^44−72^43=72.72^43−72^43=72^43.(72−1)=72^43.71.72^44−72^43=72.72^43−72^43=72^43.(72−1)=72^43.71.
Vì 72^44.71>72^43.71⇒72^45−72^44>72^44−72^43.72^44.71>72^43.71⇒72^45−72^44>72^44−72^43.
vậy 72^45−72^44>72^44−72^43.
