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DianaGabriela07
a fost răspuns

a-b=6
a) x+3•a-3*b=20
b) x•a-x•b+9a-9b=654
c)7•a-7•b+x=55
d)13+x-(5•a-5•b)=2011

Răspuns :

a) x+3(a-b)=20
x+6=20
x=20-6
x=14
b) x(a-b)+9(a-b)=654
6x+9*6=654
6x+54=654
6x=654-54
6x=600
x=600/6
x=100
b) 7(a-b)+x=55
7*6+x=55
42+x=55
x=55-42
x=13
d) 13+x-5(a-b)=2011
x-5*6=2011-13
x-30=1998
x=1998+30
x=2028

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