Petites questions pour mon Dm  1) Factoriser 9y²+30y+20
2) Développer (4y-7)²
3)calculer le nombre 2+3×4/4×7
donner l'ecriture scientifique de 65 100 000
donner les solutions de l'inéquation -8y+2≥6

meci c'est URGENT
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