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Osanuluka
a fost răspuns

A-5b=7 , sa se afle x din relatiile :
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

Răspuns :

Alex05ok
a) x+3a-15b=29
x+3(a-5b)=29,  x+21=29, x=8

b) x-123+5a-25b=137
x+5(a-5b)=260, x+35=260, x=225

c) x-2a+10b+17=4 
x-2(a-5b)=-13
x-14=-13, x=1

d) 47-x+7a-35b=2a-10b+4
43-x+7*7=-14
x=106

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