Sagot :
1 : 2m-3(5-3m)=3m+4
2m -15 + 9m = 3m + 4
2m + 9m -3m = 15 + 4
8m = 19
m = 19/8
2 : 2(n-3)-5(n-7)=0
2n - 6 -5n + 35 = 0
-3n = -29
n = 29/3
Questions 3 et 4 pas compris ce que tu as écris
probleme :
P = film policiers
S = science fiction
C = comédie
C = P + 5
S = 2 * C
C + P + S = 63 (or C = P + 5 )
P + 5 + P + S = 63
Or S = 2 * C = 2 * (P + 5) = 2P + 10
donc
P + 5 + P + 2P + 10 = 63
3P = 63 - 10 - 5
3P = 48
P = 48/3 = 16
3) 3/2 x -1/2 = 5/6
3/2 x=5/6 + 1/2
3/2 x=4/3
x=8/9
4) 5/4 x= 5/2 x - 4/3
5/4 x - 5/2 x = -4/3
-5/4 x = -4/3
x =16/15