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Monica2003
a fost răspuns

Rezolvati ecuatiile:
a)2(x+9)=30
b)5x-41=12,75
c)2x-1,2=x=4,92

Răspuns :

Anytatha


a) 2(x+9)=30 /:2

   x+ 9 = 15/- 9

    x= 6

b) 5x-41=12,75 / + 41

5x= 53,75/ : 5

x=10,75

c) 2x-1,2=4,92 /+ 1,2

2x= 6 /:2

x=3

Sper ca te-am ajutat, te pup !  
[tex]a).2(x+9)=30 \\ 2x+18=30 \\ 2x=30-18 \\ 2x=12 \\ x= \frac{12}{2} \\ x=6 \\ b).5x-41=12,75 \\ 5x=12,75+41 \\ 5x=53,75 \\ x= \frac{53,75}{5} \\ x=10,75[/tex]
[tex]c).2x-1,2=4,92 \\ 2x=4,92+1,2 \\ 2x=6,12 \\ x= \frac{6,12}{2} \\ x=3,06[/tex]

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