RĂ©ponse :
Explications Ă©tape par Ă©tape
Bonjour
Simplifier :
5(3 + 4)
= 5 x 7
= 35
9 x a + 6 x b
= 9a + 6b
(7,2 - 6,9) x 2,5
= 0,3 x 2,5
= 0,75
a + b + a x b
= a + b + ab
(a + b) x (a - b)
= a^2 - b^2
4c x (-5) x (-3a)
= 60ac
3c x 2a x (-a) x 4d
= (-24a^2cd)
1 * x + x * x * x
= x + x^3
3c x 2a x (-a) x 4d
= (-24a^2cd) => deja posée
a * (b + c) * (x + y)
= (ab + ac)(x + y)
= abx + aby + acx + acy
2 x pi x R
= 2pi R
4 x a x b
= 4ab
3 x a x a x b
= 3a^2b
Pi x R x R
= pi R^2
3a x (-6)b x 4c
= (-72abc)
a x 1 + b x b + a x b x a
= a + b^2 + a^2b
4c x (-5) x (-3a)
= 60ac => déjà posée
3a x (-6)b x 4c
= (-72abc) => déjà posée
