Question

Daca a-2b=5 , sa se afle x din relatiile :

a) x plus 2a - 4b = 15
b) 25a plus x - 50b = 200
c) 4a - 8b - x = 10
d) x plus 15 plus 3a - 6b = 30

Va rog in mai putin de 20 de minute

Dau coroana

Answer 1

a) x + 2a - 4b = x + 2(a - 2b)= x + 10 = 24 at. x = 14
b) 25a + x - 50b = 5(a - 2b) + x = x + 25 = 200 at. x = 175
c) 4a - 8b - x = 2(a - 2b) - x = 10 - x = 10 at. x = 0
d) x + 10 + 3a - 6b = x + 10 + 3(a - 2b) = x + 10 + 15 = x + 25 = 30 at. x = 5

Answer 2

a)a-2b=5
x+2a-4b=15
x+2(a-2b)=15
X+2x5=15
x+10=15
x=5
b)a-2b=5
25a+x-50b=200
25(a-2b)+x=200
25x5+X=200
125+x=200
x=75
c)a-2b=5
4a-8b-x=10
4(a-2b)-x=10
4x5-X=10
20-x=10
x=10
d)a-2b=5
x+15+3a-6b=30
x+15+3(a-2b)=30
x+15+15=30
x+30=30
x=0