bonjour SVP pouvez'vous m'aider à ce exercice Exercice 1 : Calculer et simplifier A = (-1,4) + 0 ,8 – (+2,2) B = 264,8 – 45,7 – 64,78 + 1,25 C = 2(-4+ 23) - 15

Bonsoir,

Exercice 1 : Calculer et simplifier

A = (-1,4) + 0 ,8 – (+2,2)

A = - 1,4 - 2,2 + 0,8

A = - 3,6 + 0,8

A = - 2,8

B = 264,8 – 45,7 – 64,78 + 1,25

B = 264,8 + 1,25 - 45,7 - 64,78

B = 266,05 - 110,48

B = 155,57

C = 2(-4+ 23) - 15×2

C = - 8 + 46 - 30

C = - 8 - 30 + 46

C = - 38 + 46

C + 8

D = -2,5 × (-5) ÷ 2

D = 12,5 : 2

D = 6,25

E = -34 × [(3,5 × 4 –(-22) ÷(-4)]

E = - 34 x (14 - 5,5)

E = - 34 x 8,5

E = - 289

F = -3 × (-8) ÷(-2) – (-32) ÷ (-4)

F = 24 : (- 2) - 8

F = - 12 - 8

F = - 20

G = -[7 – 15 ÷ 5] + ( -5 + 2)

G = - (7 - 3) - 3

G = - 4 - 3

G = - 7

H = - 3 + 4y × (-2) + 15 ÷5 – 3

H = - 3 - 8y + 3 - 3

H = - 8y - 3

I = [(x-y) – (x – z) –[ (z-y) + ( x + y )]

I = (x - y - x + z) - (z - y + x + y)

I = x - y - x + z - z + y - x - y

I = x - x - y + y + z - z - x - y

I = - x - y

Exercice 2 : Réduire les expressions

A = 7 × x × y × 2

A = 7xy * 2

A = 14xy

B = 3 × x × x

B = 3x²

C = 3 × x + 5 × y

C = 3x + 5y

D = 5 × x × x × 3

D = 5x² - 3

D = 15x²

E = 3 × a × b × a – c × 4 × a

E = 3a²b - 4ac

F = 2 × (3 × x × 2 × y)

F = 2 * (6xy)

F = 12xy

G = 8 × a + 15 × a – 3 × a

G = 8a + 15a - 3a

G = 20a

H = 19 x – 13 x + 11 x

H = 17x

I = 4 × b × 9 + 4 × a × a − c × 3

I = 36b + 4a² - 3c

Exercice 3 : Développer et réduire

A = - 6 ( 5/2 x – 1)

A = - 30/2x + 6

A = - 15x + 6

B = ( - x + 2 ) ( 2 x – 3)

B = - 2x² + 3x + 4x - 6

B = - 2x² + 7x - 6

C = ( 3 x – 8 )²

C = 9x² - 48x + 64

D = x (x – 2 ) – ( - x + 3 )( x + 5)

D = x² - 2x - (- x² - 5x + 3x + 15)

D = x² - 2x + x² + 5x - 3x - 15

D = x² + x² - 2x - 3x + 5x - 15

D = 2x² - 15

E = (x + 2/7 ) (x - 2/7 )

E = x² - 2/7x + 2/7x - 4/49

E = x² - 4/49