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Ex. 5 pls URGENT!!!! .......

Ex 5 Pls URGENT class=

Răspuns :

Allem222
A) x+ 3.a-3.b=20
X+3.6=20
X+18=20
X=20-18=2

B)x.a-x.b+9a-9b=654
2x-6+9.6=654
2x-6+54=654
2x-6=654-54
2x-6=600
2x=600+6
2x=606
X=606:2
X=303

C) 7.a-7.b+x=55
7.6+x=55
42+x=55
X=55-42
X=13

D)13+x-(5.a-5.b)=2011
13+x-(5.6)=2011
13+x-30=2011
X=2011+30-13
X=2041-13
X=2028

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