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a)2x/5=4/15. b)x+1/3=2/5. c)2x+1/4=5/6. d)2x+6/5-0,5=-1/10. e)2·(4x+3)=2/3. f)3/5=6/3x+1. Bara este supra va rog ajutatima la ecuatii

Răspuns :

a) 2x/5 = 4/15
2x = 4/3
x = 4/6 = 2/3

b) x + 1/3 = 2/5
x = 2/5 - 1/3 = 6/15 - 5/15 = 1/15

c) 2x + 1/4 = 5/6
2x = 5/6 - 1/4 = 10/12 - 3/12 = 7/12
x = 7/24

d) 2x + 6/5 - 1/2 = -1/10
2x = -1/10 + 1/2 - 6/5
2x = -1/10 + 5/10 - 12/10 = 5/10 - 13/10 = -8/10 = -4/5
x = - 4/10 = - 2/5

e) 8x + 6 = 2/3
8x = 2/3 - 6 = 2/3 - 18/3 = -16/3
x = -16/24 = - 2/3

f) 3/5 = 6/3x + 1
6/3x = 3/5 - 1 = 3/5 - 5/5 = - 2/5
3x = -30/2 = -15
x = -5