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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 �
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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 ... ? :
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, , 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 �