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200 x 12 BA
x
4 CB .B
400
.C AC
. 1400

50 < x < 150 ( ) x
50 < x < 200 ( )
50 < x < 100 ( )
10 40 < x < 200 ( )
p ()

5(2 − p) ≤ 7p − 2(p − 3)

4 ( ) 3 ( ) 1 ( ) 0 ()

n < 7 < n +1 n ( )
55 3 () )
5( ) 4( )
7()

c = 3 5 2 b = 33 3 a = 3 6 3 (

1<1<1 ( ) 2 1 <1 <1 ()
x
bac abc

1<1<1 () 1<1<1 ( )

cab cba

−2 ≤ x ≤ 0 ( ) x [AMC10 2001] ( )
−2 ≤ x ≤ 0 ( )
.
−4 ≤ x ≤ −2 ( )

0≤x ≤2 ( )