Question

помагите пажалуста зд 125

Answer 1

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Answer 2

4/а=16/20

а=20*4/16

а=5

с/8=25/40

с=25*8/40

с=5

39/27=b/9

b=39*9/27

b=13

49/32=12/d

d=32*12/49

d=384/49=7 41/49