Question

rezolvati in Q+ ecuatiile :
a) 2,5x+3=9,75 b) 0,25*x+1=1.5 c) 0,(2)x + 0,5 = 0,75 d) 5 supra trei x + 2 supra 9 =1 supra trei

Answer 1

a) 2,5x+3=9,75
2,5x=9,75 -3
2,5x=6,75
x=6,75/2,5
x=2,7

b) 0,25*x+1=1.5
 0,25*x=1.5 -1
 0,25*x=0.5
x=3

c) 0,(2)x + 0,5 = 0,75
0,(2)=2/9
2x/9+5/10=75/100
2x/9+1/2=3/4
8x+18=27
8x=9
x=9/8

d) 5/3 x + 2/9 =1/3
15x+2=3
15x=1
x=1/15