Réponse:
A=
\begin{gathered}5 \times (a + 7) \\ = 5 \times a + 5 \times 7 \\ = 5a + 35\end{gathered}5×(a+7)=5×a+5×7=5a+35
B=
\begin{gathered}3 \times (10 + b) \\ = 3 \times 10 + 3 \times b \\ = 30 + 3b\end{gathered}3×(10+b)=3×10+3×b=30+3b
C=
\begin{gathered}7 \times (11 + c) \\ = 7 \times 11 + 7 \times c \\ = 77 + 7c\end{gathered}7×(11+c)=7×11+7×c=77+7c
D=
\begin{gathered}8 \times (d + 8) \\ = 8 \times d + 8 \times 8 \\ = 8d + 64\end{gathered}8×(d+8)=8×d+8×8=8d+64
E=
\begin{gathered}2 \times (a - 4) \\ = 2 \times a - 2 \times 4 \\ = 2a - 8\end{gathered}2×(a−4)=2×a−2×4=2a−8
F=
\begin{gathered}5 \times (6 - b) \\ = 5 \times 6 - 5 \times b \\ = 30 - 5b\end{gathered}5×(6−b)=5×6−5×b=30−5b
G=
\begin{gathered}4 \times (9 - c) \\ = 4 \times 9 - 4 \times c \\ = 36 - 4c\end{gathered}4×(9−c)=4×9−4×c=36−4c
H=
\begin{gathered}10 \times (d - 3) \\ = 10 \times d - 10 \times 3 \\ = 10d - 30\end{gathered}10×(d−3)=10×d−10×3=10d−30
