Répondre :
A =-1/5 +10/21 X 7/5
=-1/5+70/105
=-1/5+2/3
=-3/15+10/15
=7/15
B =65/98 X 26/-21
=(5*13*2*13)/(-7*7*2*7*3)
=-845/1029
C =25/16 X 49/-75 X -32/56 X(-10)
=(5*5*7*7*16*2*10)/(4*4*25*3*7*8)
=35/6
A =-1/5 +10/21 X 7/5
B =65/98 X 26/-21
C =25/16 X 49/-75 X -32/56 X(-10)
A =-1/5 +10/21 X 7/5
=-1/5+70/105
=-1/5+2/3
=-3/15+10/15
=7/15
B =65/98 X 26/-21
=(5*13*2*13)/(-7*7*2*7*3)
=-845/1029
C =25/16 X 49/-75 X -32/56 X(-10)
=(5*5*7*7*16*2*10)/(4*4*25*3*7*8)
=35/6