Sagot :
bonjour
a + 5 ( b + c)
= 19 + 5 ( 14 + 13 )
= 19 + 5 * 27
= 19 + 135
= 154
7/3 = x /3
3 x = 21
x = 7
5 / ( 5 + x ) = 6 /5
30 + 6 x = 25
6 x = 25 - 30
6 x = - 5
x = - 5/6
- 3 - 5 - 6 x = - 2 x
- 6 x + 2 x = 3 + 5
- 4 x = 8
x = - 2
voilà pour 4 calculs
Réponse :
19 + 5(14 + 13) = 19 + 5(27) = 19+135 = 154
7/3 = X/3
donc 3X = 7 x 3
donc X = 7
5/(5+X) = 6/5
donc 5x5 = 6(5+X)
Donc 25 = 30 + 6X
donc 6X = 25-30 = -5
donc X=-5/6
-3 - 5 - 6X = -2X
-3 - 5 = -2X +6X
-8 = 4X
-8/4 = X
-2 = X
(2X+2)/5 - (5X-5)/(-5) = 4
(2X+2+5X-5)/5 = 4
7X-3 = 20
7X = 23
X=23/7