Question

ajutati ma va rog dau coroana si 20 de puncte​

Answer 1

a) 3x = 12

x = 12/3 = 4

b) 2x+17 (se calculeaza numerele cu necunoscute intre ele si termenii liberi intre ei )

c) x/9 = 11/3 => 3x = 11*9 => 3x = 99=> x = 99/3 = 33

d) 15/x = 5/7 => 5x = 15*7 => 5x = 105 => x = 105/5 = 21

e) 7/4 = x/2 => 4x = 7*2 => 4x = 14=> x = 14/4 = 7/2

f) 4/5 = 12/x => 4x = 5*12 => 4x = 60 => x = 60/4 =15

g) x/x-2 = 9/7 => 7x = 9(x-2)

7x = 9x-18

7x-9x = -18

-2x = -18

x = 18/2 = 9

h) x/11 = x-12/13 => 13x = 11(x-12)

13x = 11x -132

13x -11x = -132

2x = -132

x = -132/2 = -66

i) 18(x-1) = 8(x+2)

18x-18 = 8x+16

18x-8x = 16+18

10x = 34

x = 34/10 = 3,4