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bonjour

1 =  2 x + 12 y

2 = (3 ab + a² ) * 4 = 12 ab + 4 a²

3 = 5 x ³ - 18 y

ephtamina890

2×(x+y×6)

=2×(x+6y)

=2(x+6y)

=(2×x)+(2×6y)

=2x+12y

(3×a×b+a×a)×4

=(3ab+a^2)4

=(4×3ab)+(4×a^2)

=12ab+4a^2

5×x×x×x-9×y×2

=5×x^3-9y×2

=5x^3-18y