Réponse:
bonsoir
Explications étape par étape:
on a : m=2 et n=-3
A = 2 (m+n)
=2 (2-3)
=2 × (-1)
=-2
B= 3m-2n
=3 × 2-2 × (-3)
=6+6
=12
C= -2m^2+5n-3
= -2 × 2^2 +5 × (-3) -3
= -2 × 4 -15 -3
=-8-18
=-26
D=m (n+3)
=2 (2+3)
=2×5
=10
E = 4mn
= 4 × 2 × (-3)
= -24
F = 5m^2 -8mn
= 5 × 2^2 -8 × 2 × (-3)
= 20 + 48
=68
