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A= 1/2x(-2/-3)
A= -2/-6 = -1/-3

B= -2/6x21/5
B= -42/30 = -7/5

C= -4/5x(-7/-2)
C= 28/-10=14/-5

D= (-7)x(-9/56)
D= 63/-392= 9/-56

E= 3/14 x (-7/-3)
E= -21/-42= -1/-7

F= (-5/7)²
F= 25/49

Exo 2

A= -11/3x(-2/-7)x3/2
A= 22/- 21 x3/2=
66/-42= 11/ -7

B= 8/5x-5/3x(-9/16)
B= -40/15x -9/16
B= 360/240=3/2

C= 5/4x-8/15x(-3/-4)x4
C= -40/60 x -12/-16
C= 480/-960= 3/-6

D= -34/15x(-60/17)x3/4
D= -2040/255 x 3/4
D= -6120/1020 = 6