Question

Daca a-5b=7, atunci aflati x din relatiile:
a) x+3a-15b=29
b) x-2a+10b+17=4
c) x-123+5a-25b=137
d) 47-x+7a-35b=2a-10b+4
Ajutatima va rog dau coroana

Answer 1

Am rezovat asta......

Answer 2

x+3 (a-5b)=29 rezulta x+3×7=29
x+21=29, deci x=29-21 rezulta x=8
b) x-2 ( a+5b)+17=4
x-2×7+17=4
x-14+17=4
x+3=4
x=4-3
x=1
c) x-123+5 ( a-5b)=137
x-123+5×7=137
x-123+35=137
x-123=102
x=102+123
x= 225
d) 47-x+7 ( a-5b)=2 ( a-5 b)+4
47-x+7×7=2×7+4
47-x+49=14+4
47-x+49=18
47-x=18-49
deci x nu are solutie