Question

Cine are cel mai complet răspuns îi dau o coroană
Dacă a-5b=7,atunci aflati x din relațiile
a) x+3a-15b=29
b) x-123+5a-25b=137
c) x-2a+10b+17=4
d) 47-x+7a-35b=2a-10b+4

Answer 1

a) x+3(a-5b) = 29
    x+3*7 = 29
x+21=29
x= 29-21
x = 8
B)  x-123+5(a-5b) =137
     x-123+5*7=137
x-123+35=137
x=137+123-35
x = 225
c)  x-2(a-5b)+17=4
x-2*7+17=4
x-14+17=4
x= 4+14-17
x = 1
d) 47-x +7(a-5b) = 2(a-5b) +4
47-x+7*7=2*7+4
47-x+49=14+4
47+49-14-4=x
96-14-4 = x
78=x
observam ca peste tot dam factor comun

Answer 2

a) x+3×7=29
x=29-21
x=8
b) x-123+5×7=137
×- 123+35=137
x-158=137
x=158+137=295