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Kittykat4
a fost răspuns

20 puncte!
Determinati nr nat x,pt care au loc relatiile:
a. 12(x)+21(x)=21
b.145(x)-123(x)=18
c.11(x)+x1(4)=32

Răspuns :

Danaradu70
12(x)=1*x+2
21(x)=2*x+1
x+2+2x+1=21, 3x+3=21, 3x=18, x=6

b. 1*x^2+4*x+5-(x^2+2x+3)=18
    x^2+4x+5-x^2-2x-3=18
2x+2=18, 2x=16, x=8

c. x+1+x*4+1=32
    5x+2=32
    5x=30, x=6

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