bonsoir
exercice 58
a = 1/ 2 x -2/3 = -1/3
b = -2/6 x 21/5 = -1/3 x21/5 = -21/15 = -7*3 /5*3 = -7/5
c = -4/5 x -7/2 = -2/5 x -7 = -14/5
d = -7 x -9/56 =-7 x 9/7*8 = -1 x -9/8 = +9/8
e = 13/14 x -7/3 = 13 /7*2 x -7/3 = -13/6
f = ( -5/7)² = 25/49
exercice 59
a = -11/3 x -2/7 x 3/2
a = -11/3 x3/2 x-2/7
a = -11/2 x -2/7
a = +11/7
b = 8/5 x -5/3 x -9/16
b = -8/3 x -9/16
b = -4*2/3 x -3*3/ 4*4
b = + 3/2
c = -5/4 x -8/15 x -3/4 x 4
c = + 2/3 x -3
c = +2
d = 34/15 x -60/17 x 3/4
d = 34/15 x -15/17 x3
d = 34 x -1/17 x3
d = 34 x -3/17
d = 17 x -3
d = -51