1,
$a, 3^5$
$b, y^4$
$c,2.2.2.x.x.x.x$
$=2^3.x^4$
$d, a^2+b^2+c^4$
$2,$
$a, 2^7=2.2.2.2.2.2.2=128$
$b, 4^4=4.4.4.4=256$
$c, 5^5=5.5.5.5.5=3125$
$3,$
a, $2^6$ và $6^2$
$2^6=4^2.2^2$
$6^2=3^2.2^2$
$4^2>3^2$
$⇒4^2.2^2>3^2.2^2$
$⇒2^6>6^2$
b, $3^4$ và $4^3$
$3^4=81$
$4^3=64$
$81>64$
$⇒3^4>4^3$
c, $5^4$ và $4^5$
$5^4=625$
$4^5=1024$
$625<1024$
$⇒5^4<4^5$