Education 05-10-2018

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 5,  2018- 

5.    4:5,  ... 120  ... ? . 4 . 8 . 20 . 6 :  : a:b = 4:5, LCM = 120 .�.�. = LCM /(axb) = 120/(4x5) = 6 -3: �  .�.., .�.�.    � � .�.. .�.�.� ��.

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   � � ��. 1. .. 600, ... 15     . . 4 . 3 . 2 . 6 :  : � (.�.)/(.�.�) = 600/15 = 40 � 40  ���  (1, 40), (2, 20), (4, 10), (5, 8) �  �   (1, 40) (5, 8) � ��   = 2 �

8 x9 x4    ? 5

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  � �    ��� �.     : � N  � , N = 2px3q x5rx7s  ���  = (p+1)(q+1)(r+1)(s+1) 1 ��   ��  = (p+1)(q+1)(r+1)(s+1)-1 1,   ��  ���  = (p+1)(q+1)(r+1)(s+1)-2 �  ���  = p(q+1)(r+1)(s+1) �  ���  = (q+1)(r+1)(s+1) � N  ���   = {(2p+1-1)/(2-1))((3q+1-1)/(3-1))((5r+11)/(5-1)}...... � N   ��� � � ��  i. 1/2[(p+1)(q+1)(r+1)] (N   �) ii. 1/2[(p+1)(q+1)(r+1)](N  ) � N  ���   = N1/2[(p+1)(q+1)(r+1)] � N  � ���  = p+q+r+s 1. 220, 284   ? : � 220 = 22x51x111 ���  = (2+1)(1+1)(1+1) = 3x2x2 = 12 ���  = {(22+1-1)/(21))((51+1-1)/(5-1)}{(111+1-1)/(11-1)} = 7(24/4)(120/10) = 504 284 = 22x711 ���  = (2+1)(1+1) = 3x2 ���  = {(22+1-1)/(2-1)) ((711+1-1)/(71-1)) = 7(5040/70) = 504 : �   ���  � �   �. : 220, 284   2. 1995   ? . 8 . 16 . 32 . 64 :  : � 1995 = 31x51x71x191 � ��� (��)  1995 = (1+1)(1+1)(1+1)(1+1) = 16 3. 240   ? . 750 . 754 . 744 . 792 :  : � 240 = 24 x 31 x 51 ���   � = ((24+1-1)/(2-1))((31+1-1)/(3-1)) {(51+1-1)/(5-1)} = (32-1/1)(9-1/2)(25-1/4) = 31x4x6 = 744 4. 28  ? . 21952 . 24944 . 25864 . 24594 :  �

: � 28 ��� = 4x7 = 22x71 =281/2{(2+1)(1+1)} = 283 = 21952 5. 64      ? -4 . 4 . 5 . 6 . 8 :   :  � 64 = 26 �� ��  = 1/2[(6+1)+1] = 4 [64 ] 6. 144   ? . 2 . 3 . 4 . 5 :  : � 144 = 24x32 p = 4, q = 2 �  ���  = (q+1)(r+1)(s+1) = (2+1) = 3 7. 144   ? . 10 . 12 . 15 . 18 :  : � �

 ���  = (4+1)(2+1) = 15 8. 85x94x48   ? . 39 . 52 . 45 . 42 :  : � 85x94x48 = (23)5x(32)4x(22)8 = 215x38x216 � � ���  = ���  = 15+8+16 = 39 9. 162 1,      ? . 10 . 12 . 8 . 14 :  : � 162 = 21x34 1,   � ���  = (1+1)(4+1)-2 = 8 ..., ... : �   � �   ��� � �� �. : 12 ��� = {1, 2, 3, 4, 6, 12} �     �� 1 �     ��   �   ���    : �  �      ���   � ���  � �� ��� �. : 12 ��� = {1, 2, 3, 4, 6, 12} 18 �� = {1, 2, 3, 6, 9, 18}  ��� = {1, 2, 3, 6} :

   1, 2, 3......� �     � �. : 5 � = {5, 10, 15, 20,.......} 7 � = {7, 14, 21,.....} �    �  �    ��      �    ��    .  : �  �   � �    �� � �. : 3 � = {3,6,9,12,15,.......} 6 � = {6,12,18,24,.....}  � = {6,12,18,24,.....}    (..): �  �      ��   �� � .�.. �. : 6 � = {6,12,18,24,30,.......} 8 � = {8,16,24,32,.....}  � = {24,48,72,.....} .�.. = 24 ...  : 1. 8, 12  ... ? : � 8 � = {8,16,24,32,.......} 12 � = {12, 24, 36,.....} �� � = {24,48,72,.....} .�.. = 24 ( ��   ) : �    .�.. � �   � 5, 6  .�.. = 5x6 = 30 �  �  .�.. � �    3,7 .�.. = 3x7 = 21 �  �  ,   ��   .�.. . 8, 24� 8   24 ��. .�.. = 24 .�.�.  : 1. 6, 8 ... ? :   : � 6 � = {1, 2, 3, 6,.......} � 8 � = {1, 2, 4, 8,.....} �� ��� = {1, 2.....}  �� �(.�..�) = 2 -1: �    ..., ...: 2. 72, 108, 2100 ... ? : �   � ���  ��, ��  � �  � ���  .�.. . 72 = 23x32 108 = 33x22 2100 = 22x52x31x71 .�.. =23x33x52x71 = 37,800 3. 108, 288, 360 ... ? :

 

   , ,  9441022571   � ���  ��, ��   ��  � ���    .�.. . 108 = 22x32 288 = 25x32 360 = 23x32x5 .�.�. =22x32 = 36 : �  �  .�.. = 1 �  �  ,   ��   .�.�. . �   .�..�� 1  �  �  �  �. �    .�.�. = 1 2 -2: � ..., ...  : �   .�.., ..�. ,    � �. � L.C.M. x G.C.F. = axb 1.   ... 1008, ... 36.     144    ? . 252 . 250 . 280 . 200 :  : � axb = LxG 144xb = 1008x36 b = (1008x36)/144 = 252 �  = 252 2.   39, 26  ... 78  ... ? . 26 . 10 . 12 . 13 :  : � LxG = axb 78xG = 39x 26 G = (39x26)/78 = 13 �  = 13 3.    4212, ... 9  ... ? . 460 . 468 . 461 . 464 :  : � LxG = axb L = (axb)/G = 4212/9 = 468 4.    7:9,  ... 630  ... ? . 70 . 90 . 10 . 20 :  : �   7x, 9x � 7x, 9x  .�.. = 63x 63x =630, x =10 7x, 9x  .�.� = x = 10 �


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