Bonjour pouvez vous m'aider svp? donne le signe de chacun des produits suivants:

A=(-1 ) x 2 x (-3) x4...... x (-9)

B= (-1) x (-2) x (-3) x (-4) x ..... x (-12)

C= (-4) x (-3) x (-2) x ....x 3 x 4 x 5

Je ne comprends pas les pointilles et comment savoir quel signe a mettre...

Merci!
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