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Viorica23
a fost răspuns

Sa se afle x din:
a)x+2/x=5/4;
b)x/x+1=3/4;
c)x/4=x+3/7.

Răspuns :

Ardnaxela1
a)
x+2/x=5/4
x^2+2x=5x/4x
4x^2+8x=5x
4x^2+8x-5x=0
4x^2+3x=0
x(4x+3)=0
x=0 sau 4x+3=0 => 4x=-3 => x=-3/4

b)
x/x+1=3/4
1+1=3/4
=>ecuatia nu are solutii.

c)
x/4+x=3/7
7x+28x=4
35x=4
x=4/35

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