aides moi svp j y comprends rien

=(225)x4-(75+210)
=900-(285)
=900-285
=615
b/=1000+1800 sur 4 x(6)-1800
=2800sur 4=700x(6)-1800
=4200-1800
=4200-1800
=2400
c/=3x[100:(25)]
=3x(4)
=12