Bonsoir, j’ai un exercice de mathématique que je ne comprends pas pouvez vous m’aidez svp merci d’avance

Bonjour,

Aire = longueur x largeur

Volume = aire x hauteur

A = 22 x 14 = 308 cm²
V = A x 5 = 308 x 5 = 1540 cm³

A = 90 = 18 x l
l = 90/18 = 5 cm

V = A x 6 = 90 x 6 = 540 cm³

V = 1320 = A x 8
A = 1320/8 = 165 cm²

A = 15 x l
l = 165/15 = 11 cm

A = 260 = 20 x l
l = 260/20 = 13 cm

V = 2080 = A x h
h = 2080/260 = 8 cm

A = 14 x 12 = 168 cm²

V = 2520 = A x h
h = 2520/168 = 15 cm

2ieme tableau :

aire de base = a x a
Aire totale = 6 x aire de base

V = a x a x a = À(base) x a

a = 15 cm
A(base) = 15 x 15 = 225 cm²
At = 6 x 225 = 1350 cm²
V = 15 x 15 x 15 = 3375 cm³

Aire de base : 121 cm²
a = √121 = 11 cm
At = 6 x 121 = 726 cm²
V = 121 x 11 = 1331 cm³

Aire totale = 294 cm²
A(base) = 294/6 = 49 cm²
a = √A(base) = 7 cm
V = 49 x 7 = 343 cm³

V = 27 cm³
a = ³√27 = 3 cm
A(base) = 3 x 3 = 9 cm²
At = 6 x 9 = 54 cm²

1 m³ = 1000 dm³ = 1 000 000 cm³ = 1 000 000 000 mm³

0,087 m³ = 87 dm³ = 87000 cm³ = 87000000 mm³

345000 mm³ = 345 cm³ = 0,345 dm³ = 0,000345 m³