Sagot :
Réponse:
3 12 3 × 12 36 2 × 18 18 9 × 2 9
B = ----- × ------ = ---------------- = ---------- = ----------- = -------- = -------- = -----
4 7 4 × 7 28 2 × 14 14 7 × 2 7
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- 3 9 -15 + 9 -6 2 × (-3) - 3
A = ----- + ------ = ---------- = ------- = ---------- = ------
5 20 20 20 2 × 10 10
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