(4)一般型の展開 1(解答) 学習日    月    日(   )
 乗法公式 3 (一般型の展開)  (x+2)(x+3) 
  =x2+(2+3)x+2・3
  =x2+5x+6
(xa)(xb)=x2+(ab)xab 
            
 
乗法公式を使って,次の式を展開しなさい。
 (x+1)(x+2) = x2+3x+2
  
 (x+3)(x+5) = x2+8x+15
  
 (x+7)(x+1) = x2+8x+7
 
 (x+9)(x+4) = x2+13x+36
 
 (x+5)(x+7) = x2+12x+35
 
 (x+6)(x+2) = x2+8x+12
 
 (x−4)(x−5) = x2−9x+20
  
 (x−2)(x−9) = x2−11x+18
  
 (x+7)(x−4) = x2+3x−28
  
10  (x−1)(x+3) = x2+2x−3
 
11  (x+2)(x−8) = x2−6x−16
  
12  (x−6)(x+5) = x2x−30
  
13  (x−4)(x+1) = x2−3x−4
  
14  (x+3)(x−9) = x2−6x−27
  
15  (a+5)(a−1) = a2+4a−5
  
16  (y−4)(y+2) = y2−2y−8
  
17  (b+4)(b+7) = b2+11b+28
  
18  (n−3)(n+2) = n2n−6
  
19  (x)(x) = x2x
 
20  (x+0.4)(x−0.3) = x2+0.1x−0.12
 

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