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## 全文

(1)

(1) ( −6) −6 = 0 (2) 2( + 2) −14 = 0

(3) (x+ 1)2 = 30 (4) (x+ 3)2 = 43

## 2.

(1) −11a =a218 (2) a2+a = 0

(3) −a =−a2+ 20 (4) −7x=x2

## 3.

(1) 7 + 8x= 2x2 (2) 4x2 =6x1

(2)

(1) ( −6) −6 = 0

### 6

(2) 2( + 2) −14 = 0

(3) (x+ 1)2 = 30

(4) (x+ 3)2 = 43

(2) a2+a = 0

(3) −a =−a2+ 20

(4) −7x=x2

## 3.

(2) 4x2 =6x1

(3) 8x=x2+ 10

### 6

(4) −2x=x2−6

(3)

(1) 4( −4) −60 = 0 (2) 5( −3) = 25

(3) (x2)210 = 0 (4) (x3)2 = 12

## 2.

(1) x22x8 = 0 (2) a2+ 9a =−18

(3) x24x = 5 (4) 9x+ 10 =x2

## 3.

(1) 4x2+ 16x+ 3 = 0 (2) 4x216x+ 11 = 0

(4)

(1) 4( −4) −60 = 0

(2) 5( −3) = 25

(3) (x2)210 = 0

(4) (x3)2 = 12

(2) a2+ 9a =−18

(3) x24x = 5

(4) 9x+ 10 =x2

## 3.

### 2

(2) 4x216x+ 11 = 0

(3) 2x=x29

(4) 4x2 =16x+ 13

### −

(5)

(1) ( + 1) −41 = 0 (2) ( −2) −12 = 0

(3) 4(x4)272 = 0 (4) (x+ 4)221 = 0

## 2.

(1) 8a =a212 (2) −8x+ 9 =x2

(3) x2 =x+ 2 (4) 9x8 =x2

## 3.

(1) 6x7 =x2 (2) x210x19 = 0

(6)

(1) ( + 1) −41 = 0

### 41

(2) ( −2) −12 = 0

(3) 4(x4)272 = 0

### 2

(4) (x+ 4)221 = 0

(2) −8x+ 9 =x2

(3) x2 =x+ 2

(4) 9x8 =x2

## 3.

(2) x210x19 = 0

(3) −6x+ 2 =x2

### 11

(4) x2 =10x4

(7)

(1) 5( −3) = 25 (2) ( −3) −3 = 0

(3) (x+ 6)2 = 43 (4) (x+ 2)2 = 2

## 2.

(1) −10x=x29 (2) x23x+ 2 = 0

(3) 2a =a2+ 3 (4) x2 =−7x+ 8

## 3.

(1) 8x28x+ 1 = 0 (2) 2x2+ 6x15 = 0

(8)

(1) 5( −3) = 25

(2) ( −3) −3 = 0

(3) (x+ 6)2 = 43

(4) (x+ 2)2 = 2

(2) x23x+ 2 = 0

(3) 2a =a2+ 3

(4) x2 =−7x+ 8

## 3.

### 4

(2) 2x2+ 6x15 = 0

(3) x24x = 31

### 35

(4) x28x= 5

(9)

(1) ( −4) −35 = 0 (2) 3( + 6) = 33

(3) 4(x+ 5)292 = 0 (4) 3(x+ 5)2 = 6

## 2.

(1) x2+ 7x18 = 0 (2) x2+ 5x=−4

(3) −11x=x2 (4) −8x=x212

## 3.

(1) −9−8x=x2 (2) x2+ 10x+ 14 = 0

(10)

(1) ( −4) −35 = 0

(2) 3( + 6) = 33

### 11

(3) 4(x+ 5)292 = 0

(4) 3(x+ 5)2 = 6

(2) x2+ 5x=−4

(3) −11x=x2

(4) −8x=x212

## 3.

### 7

(2) x2+ 10x+ 14 = 0

(3) −2x=x2 −39

### 10

(4) −13 =x2+ 8x

(11)

(1) ( −6) = 5 (2) 5( + 5) −85 = 0

(3) 3(x6)233 = 0 (4) (x+ 2)210 = 0

## 2.

(1) x2 =−7x+ 8 (2) a2 =−4a3

(3) 8a12 =a2 (4) a2 = 12a11

## 3.

(1) x26x32 = 0 (2) x2+ 8x11 = 0

(12)

(1) ( −6) = 5

### 5

(2) 5( + 5) −85 = 0

(3) 3(x6)233 = 0

### 11

(4) (x+ 2)210 = 0

(2) a2 =−4a3

(3) 8a12 =a2

(4) a2 = 12a11

## 3.

(2) x2+ 8x11 = 0

(3) 4x+ 17 =x2

(4) 2x26x= 5

### =

(13)

(1) 3( + 6) −18 = 0 (2) ( −5) −37 = 0

(3) (x+ 5)2 = 41 (4) (x+ 4)2 = 30

## 2.

(1) x210x11 = 0 (2) a2+a20 = 0

(3) x2 =−10x+ 11 (4) x2+ 7x=−12

## 3.

(1) 6x= 2x2+ 3 (2) 4x2 = 12x+ 13

(14)

(1) 3( + 6) −18 = 0

### 6

(2) ( −5) −37 = 0

(3) (x+ 5)2 = 41

(4) (x+ 4)2 = 30

(2) a2+a20 = 0

(3) x2 =−10x+ 11

(4) x2+ 7x=−12

## 3.

### 2

(2) 4x2 = 12x+ 13

(3) x2 = 29 + 8x

### 5

(4) 23 + 8x=x2

(15)

(1) ( + 4) = 8 (2) ( −5) −20 = 0

(3) 2(x+ 2)2 = 48 (4) 5(x3)2 = 60

## 2.

(1) x2+ 10x+ 16 = 0 (2) a2 =−3a+ 18

(3) x2 = 3x+ 4 (4) 8x+ 9 =x2

## 3.

(1) x23x+ 1 = 0 (2) 4x2+ 12x+ 7 = 0

(16)

(1) ( + 4) = 8

### 2

(2) ( −5) −20 = 0

### 5

(3) 2(x+ 2)2 = 48

(4) 5(x3)2 = 60

(2) a2 =−3a+ 18

(3) x2 = 3x+ 4

(4) 8x+ 9 =x2

## 3.

### 2

(2) 4x2+ 12x+ 7 = 0

(3) 4x2+ 20x =13

### 2

(4) x2 = 254x

(17)

(1) 4( −5) = 68 (2) 2( −1) −10 = 0

(3) 5(x+ 2)2 = 100 (4) 4(x+ 4)2 = 96

## 2.

(1) x2+ 10x+ 9 = 0 (2) −9x=x214

(3) −6x8 =x2 (4) −13a12 =a2

## 3.

(1) x2+ 5x1 = 0 (2) 1 = 4x24x

(18)

(1) 4( −5) = 68

### 17

(2) 2( −1) −10 = 0

### 5

(3) 5(x+ 2)2 = 100

### 5

(4) 4(x+ 4)2 = 96

(2) −9x=x214

(3) −6x8 =x2

(4) −13a12 =a2

## 3.

(2) 1 = 4x24x

(3) x2 =6x+ 26

### 35

(4) 28 =x24x

(19)

(1) 4( −4) = 84 (2) ( −6) −21 = 0

(3) (x+ 2)2 = 37 (4) (x+ 3)28 = 0

## 2.

(1) 4x+ 5 =x2 (2) a22a = 0

(3) 7a =a2+ 18 (4) 13x12 =x2

## 3.

(1) 4x220x+ 15 = 0 (2) 6x= 3x2+ 2

(20)

(1) 4( −4) = 84

### 21

(2) ( −6) −21 = 0

(3) (x+ 2)2 = 37

(4) (x+ 3)28 = 0

(2) a22a = 0

(3) 7a =a2+ 18

(4) 13x12 =x2

(2) 6x= 3x2+ 2

(3) 8x= 8x21

(4) x2 =6x+ 32

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