Question

so sánh hai biểu thức

A= 72^45- 72^44

B=72^44-72^43

Answer 1

72^45 - 72^44 = 72^44 . 71

72^44 - 72^43 = 72^43 . 71

Vì 72^44 > 72^43

nên  72^44 . 71 > 72^43 . 71

==> A>B

Answer 2

A=72^45-72^44=72^44(72-1)=72^44x71

B=72^43x71

=>A>B