v e f
A= {2, 4, 6, 8}
2 ∉A
-2
0
{5} ⊂ A
3∈A
x=1
1
{2 , 6 } ⊂ A
3x -4 = x +2
x=3
2
x =- 1
x =- 3
2x + 4＞0
x＞2
(1, 2)
(-1,
(-1, 2)
-2)
x ＜ -2
(1, -2)
7x 5
50
60
60
70
80
90
70
90
5x + 2y
7x 6
12x 6
8
㉠
100
2
( 4x -3y ) + ( x +5y )
12x 5
1
80
7
3x + 2y
x ＜2
x ＞ -2
4x 2 × 3x 3
6
v-e+f
y = x +1
2
y=x
2
x +2 = 0
2x + y -3
+2
20
8
3x - 8y
5x - 8y
9
1
6
2
3
1
3
1
2
∠x
AB = AC ∠ B = 70°
△ABC
40°
A
50°
B
60°
C
70°
∆
∆
∆
D
∠C = 90°
∆
BC = 1cm
AB
ABC
AC = 1 cm
1cm
2cm
3: 4
4
4: 3
±2
±8
2: 3
3: 2
± 16
± 32
2cm
2 2cm
O
AB= 8cm
AH
OH ⊥ AB
3cm
2x( x -1)
2x -1
3.5cm
2x -2x
2
2
2x 2 +1
4cm
2x 2 + 2x
x=3
( x -3)( x -2) = 0
( x -5)( x -2) = 0
4.5cm
( x +3)( x +2) = 0
( x +5)( x +2) = 0
∠C = 90°
ABC
tan
5
13
12
5
y =x
y=
2
y =-2 x
2
2
x
3
y =-
12
13
2
1
x
2
2
5
12