=5/2—2/3

(3) (2( (12—/20) =/2 x 12—/2 x 20=/24—/ 40

(5)

= {2x6—/2°x5

=2/6—/2?x2x5 =2/6—2,10

0/8 _ f10— 2”, 76 _ Y5( 10-2”) 45 (5 5

15 _ (5x10—/5x2 _ {50-/2°x2x5 5 5

-12×5”-2/10 _ 5/2—2/10 5 5

13 3 13 3, (3/3 3/3 2 (3 2 {3 {3 2 3

_ (3x3 37382 2x3 3x2 _ 313 6/3 _ 3/3-6/3 _ (3-6) /3 6 6 6 6 = 3/8 -3%8-8__ 18 6 3X2 2

© {72-~ (m= LO — 62 _ & we

(2x5 2/5 2/5 “Ts

_ 6x (2X5 _ 2x3x/10 _ 3/10

~~ 2※5 2x5