Réponse:
A= -3×s+(-3)×5
= -3s+(-15)
B= -7×t +7× 3
=-7t +21
C= 4×-5u -4× 1
= - 20u + (-4)
D=9×(-2)-9×7v
= -18 -63v
E=4w×10 - 4w×w
=. 40w - 4w²
F= -x× 4x +x×9
= - 4x² + 9x
