Question

Afla numarul natural x daca : a) x+3 supra x-1 = 9 supra 7 b)18 supra 12 = ex+1 supra 10 c) x+4 supra 3x+2= 15 supra 20 d) x-3 supra 2x +1 =1 supra 3
Repede plsss. dau 85 de puncte rog frumos

Answer 1

Răspuns:

Explicație pas cu pas:

Answer 2

Răspuns:

a) 9(x-1)=7(x+3)

9x-9=7x+21

9x-7x=21+9

2x=30=>x=30:2=>x=15

________

b) 12(x+1)=10·18

12x+12=180

12x=180-12

x=168:12=>x=14

__________

c) 20(x+4)=15(3x+2)

20x+80=45x+30

80-30=45x-20x

25x=50=>x=2

________

d) 3(x-3)=2x+1

3x-9=2x+1

3x-2x=1+9

x=10