Exercices de calcul littéral en cinquième (5ème). Exercices : I) Réduire (si possible) et supprimer les signes × : A = 5 × x × y B = 3 × 6 × x C = 6

Exercices de calcul littéral en cinquième (5ème).

Exercices :

I) Réduire (si possible) et supprimer les signes × :

A = 5 × x × y

B = 3 × 6 × x

C = 6 + 10 × x

D = 7 × x × y × 2

E = 3 × x × x

F = 3 × x + 5 × y

G = 6 × x − 3 × y

H = 8 × x × 3 × y

I = a × 4 + 6 × b

J = 5 × x × x × 3

K = [(a / 4) + (b × 2)]

L = 3 × a × b × a – c × 4 × a

M = 2 × (3 × x × 2 × y)

N = 8 × a + 15 × a – 3 × a

O = 19 x – 13 x + 11 x

P = 4 × b × 9 + 4 × a × a − c × 3

Q = 2 × a × a + b × b × b

I) Sachant que x = 8 ; y = 5 et z = 1 calculer :

A = 5 x + 3

B = 5 x × 3

C = 5 (x + 3)

D = (5 + x) × 37

E = 2 x − 3 y + 2 z

F = 6 x + 2 y − 4 z

G = 8 x + 3 − 3 y

H = x + y (3 x − 2 y)



I) Développer puis réduire :

A = 8 (x – 3)

B = 5 (2 x − 6)

C = 3 (5 x – 4)

D = 6 (3 x + 9)

E = 2 (4 x + 4 y − 3)

F = 3 x (2 x − 7)

G = 4 (2 x + 5) + 3 (x − 6)

H = 2 (3 x + 4 y – 2)

I = 2 x (x + 1) + x (5 x − 2)

J = 2 (3 x + 5) + 4 (2 x + 3)

K = 3 (2 x + 5) + 2 (4 x + 3)

L = 4 (2 x + 7) + 3 (x − 6)

M = 5 (3 x + 4) + 6 (2 x − 3)

N = (x – y) × x

O = 2 (4 a + 2 b) + 3 (6 a – b) + a (2 + b)

P = 4 (2 x + 3 y + 4) + 3 (5 x + 2 y − 5)

Q = 3 x (5 x + 3) + 6 x² + 2

I) Factoriser :

A = 6 a – 3

B = 4 – 4 x

C = 9 a + 5 a2

D = a × b – 13 a

E = 2 a × 3 x + 4 × 2 a

F = 4 a2 – a b

G = x × 3 b + x × c

H = 3 a b + 3 a c

I = 6 a b + 2 a c

J = 2 a + 7 a × 2 b – 3 a2 × 2

I) Calculer de deux façons différentes :

A = 3 × 5 + 3 × 2

B = 6 × 2 − 5 × 2

C = 4 (5 − 3)

D = 4 × 5 + 4



I) Calculer astucieusement :

A = 45 × 99

B = 2,7 × 3,6 + 2,7 × 6,4

C = 18 × 101

D = 57 × 0,82 + 0,82 × 43

E = 34 × 45 + 64 × 45 – 45 × 8

F = 12 × 9,9

G = 7,53 × 3,26 + 6,74 × 7,53

H = 456,7 × 1001

I = 12 × 199

J = 21 × 65,7 + 9 × 65,7 + 30 × 34,3

K = 265 × 102