URGENT noté On donne les expressions numérique

A=2×10²+10¹+10⁻¹+2×10⁻²

B=21×10⁻⁴×500×(10²)³/0.7×10⁸

C=4×10⁻²×9×10⁶/6×10⁷×12×10⁴

1)Donner l'écriture décimale de A B C
2)Donner l'écriture scientifique de A B C
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