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x2 − 1 .1 = 1
y2 y
y7
)
. 25 − 1 = 24 6 )

77

:( ) (

. 3 ≤ 3x + 5 ≤ 6 ⇔ −2 ≤ 3x ≤ 1 ⇔ − 2 ≤ x ≤ 1 (

33

.x = 0

.x :( )

30x + 500 ≥ 1500 ⇔ 30x ≥ 1000 ⇔ x ≥ 33.3

. 34