Question

Sa se afle x din proporțiile următoare ​

Answer 1

Răspuns:

Explicație pas cu pas:

a)

3*(2x+5)=2*(3x-1)

6x+15=6x-2

15= -2 ( nu exista solutie )

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b)

4x=5*(3x+2)

4x=15x+10

15x-4x=10

11x=10

x= 10/11

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c)

3*(x²+1)=3x*(x+5)

3x²+3=3x²+15

3=15 (nu are solutie )

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d)

(x+2)(x-1)=(2-x)(1-x)

x²-x+2x-2=2-2x-x+x²

x²+x-2=x²-3x+2

x²+x-x²+3x= 2+2

x+3x=4

4x=4

x=4/4

x=1

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e)

(6x+2)*2(x+5)=3x*(4x+1)

(6x+2) (2x+10)=12x²+3x

12x²+60x+4x+20=12x²+3x

12x²-12x²-3x+4x+60x= -20

-3x+4x+60x=-20

x+60x= -20

61x=-20

x= -20/61