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Alexia6661
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Răspuns :

Adrianalitcanu2018
a)
6(x+1)=7x
6x+6=7x
6x-7x=-6
-x=-6
x=6

Cu proprtii derivate: 
Scadem numitorul din numarator:
x+1/x=7/6
x+1-x/x=7-6/6
1/x=1/6
x=6

b)
9x=7(x+2)
9x=7x+14
9x-7x=14
2x=14
x=7

Cu proportii derivate:
Scadem din numitor numaratorul:
x/x+2=7/9
x/x+2-x=7/9-7
x/2=7/2
x=7

c)
9x=8(x+1)
9x=8x+8
9x-8x=8
x=8

Cu proportii derivate:
x/8=x+1/9
Intai inversam locul mezilor:
x/x+1=8/9
Scadem din numitor numaratorul:
x/x+1-x=8/9-8
x/1=8/1
x=8

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