bonjour aider moi svp c est l exercice 92

A=-2x/7+3/4
=-2/7*7/8+3/4
=-1456+3/4
=-14/56+42/56
=-28/56=-14/28=-7/14=1/2=-0.5

A=-2x/7+3/4
=-2/7*7/2+3/4
=-2/2+3/4
=-4/4+3/4
=-1/4=-0.25

A=-2x/7+3/4
=-2/7*1.25+3/4
=-2.5/7+3/4
=-10/28+21/28
=-31/28

A=-2x/7+3/4
=-2/2*-2+3/4
=47+3/4
=16/28+12/28
=28/28
=1