Explications étape par étape:
A = 5 × (a + 7) C = 7 × (11+c)
A = 5×a + 5×7 C = 7×11 + 7×c
A = 5a+35 C = 77+7c
B = 3 × (10+b) D = 8 × (d+8)
B = 3×10 + 3×b D = 8×d + 8×8
B = 30+3b D = 8d+64
E = 2 × (a-4) G = 4 × (9-c)
E = 2×a - 2×4 G = 4×9 - 4×c
E = 2a-8 G = 36-4c
F = 5 × (6-b) H = 10 × (d-3)
F = 5×6 - 5×b H = 10×d - 10×3
F = 30 - 5b H = 10d-30
I hope I have helped you have a nice day
