Page 152 - aljaber
P. 152
QSY@ @pbåîbjn¾a a <b ()
1>1
ab .a < c b < c
a <b ()
.
.c > 0 .c = 1
a < b ⇒ a ×c < b ×c ab
⇒a× 1 <b× 1
ab ab
⇒1<1
ba
ab
a <x <b
ab . a ≤x ≤b
a <x <b
.(x < b a < x )
. 3x + 4 > 5x − 1 ()
