Simplifier le plus possible -21 _____ -36 -45 ______ 105

-21/-36
= -7 x 3 / -12 x 3
= 7/12

-45/105
= -5 x 9 / 5 x 21
= -9/21
= -3 x 3 / 7 x 3
= -3/7

-21    
____
-36
=-21:3
_______
-36:3
=-7
_____
-12

-45
_____
105

=--45:15
________
105:15

-3
__
7