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Explications étape par étape:

Exercice 1

1)

A.

[tex]2 - \frac{5}{4} \times \frac{1}{10} = 2 \: - \: \frac{5}{40} = \: \frac{80}{40} - \frac{5}{40} = \frac{75}{40} = \frac{15}{8} [/tex]

B.

[tex]\frac{3 - 2}{5} + \frac{3}{10} = \frac{1 \times 2}{5 \times 2} + \frac{3}{10} = \frac{2 + 3}{10} = \frac{5}{10} = \frac{1}{2} [/tex]

2)

(3x – 5)(x – 3)

3x² – 9x – 5x + 15

3x² – 14x + 15

2(3x –1)(–x +7)

2(–3x²+21x+x–7)

2((–3x²+22x–7))

–6x²+44x–14

Exercice 2

2x – 3 = –1

2x = 3–1

2x = 2

x = 1

A toi de faire la b et la c.

Exercice 3

3x +12

3(x+4)

-x² + x

x(-x +1)

(2x –5) ((x–8)+(2x-5))

(2x –5) (x–8+2x-5)

(2x –5) (3x-13)