Sagot :
D=4/9-2X13+3/13-3
=4/9-2X16/10
=4/9-3,2
=-124/45
E=18-16/4/7
=2/4/7
=7/2
=3,5
F=(-1/5-2/7)/(1-15/49)
=(-17/35)/(34/49)
=-7/10
Fini !!
D=4/9-2X13+3/13-3
=4/9-2X16/10
=4/9-3,2
=-124/45
E=18-16/4/7
=2/4/7
=7/2
=3,5
F=(-1/5-2/7)/(1-15/49)
=(-17/35)/(34/49)
=-7/10