Réponses

2013-03-06T23:22:20+01:00
1) a. 1,2*1/4+6 = 0,3 + 6 = 6,3
b. -8/7*1/4+6

2) 1/4x + 6

3) 1/4x + 6 = 15
1/4x = 15-6
1/4x = 9
x = 9*4
x=36
2013-03-06T23:26:35+01:00
1) a) 1,2 x 1/4 + 6 = 6,3
b) - 8/7 x 1/4 + 6 = - 8/28 + 6 x 28/1 x 28 = 20/28
2) f(x) = x*1/4 + 6
3) f(Antécédent) = 15
x*1/4 + 6 = 15
x*1/4 = 15 - 6
x*1/4 = 9
1/4 x = 9
1x = 9 x 4 = 36