e simplifiée :
A) 7/6 x 6/13
B) 5/6 x 4/15 x 3/2
C) 9/12 + 5/12 + 13/12
D) 4/3 - 5/6
E) 2/7 + -5/14
F) 1/3 - 2
G) -1/3 + 5/2
H) -2/7 x -21/14
I) (-4) x 3/-5
J) -4/7 : -5/8
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A) 7/6x6/13=7x6/6x13=42/78
B) 5/6x4/15x3/2=5x4/6x15x3/2=20/90x3/2=60/180
C) 9/12+5/12+13/12=14/12+13/12=27/12
D) 4/3-5/6=4x2/3x2-5/6=8/6-5/6=3/6
E) 2/7+ -5/14=2x2/7x2-5/14=4/14-5/14=-1/14
F) -1/3-2=-1/3-2x3/1x3=-1/3-6/3=-7/3
G) -1/3+5/2=-1x2/3x2+5x3/2x3=-2/6+15/6=13/6
H) -2/7x-21/14=-2x2/7x2-21/14=-4/14-21/14=-25/14
I) (-4)x3/-5=-4/1x3/-5=-12/-5
J) -4/7:-5/8=0,8-0,875=-0,075
Voilà