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Sagot :

Bonsoir,

21)

a. 3x * 5 = 15x

b. 3 + 5x

c. 3x - 5x = - 2x

d. 3x + 5x²

e. 3x * 5x² = 15x³

f. 3 + x + 5 + x² = x² + x + 8

g. 3x² + 5x² = 7x²

h. - 3x + 5x = 2x

i. - 3 * 5x = 15x

32)

a. 4 + (x - 3) * 5 = 4 + 5x - 15 = 5x - 11

b. 2x (x + 1) - x = 2x² + 2x - x = 2x² + x

c. - (4 - x) * 2 = - (8 - 2x) = - 8 + 2x

d. 3 * (5x * 2) + 4 = 3 * 5x² + 4 = 15x² + 4

e. 3 * x + x * 2x + 3 * 4 + 2x * 4 = 3x + 2x² + 12 + 8x = 2x² + 11x + 12.

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