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(X-1)^2=49
(2x+1)^2=81


Răspuns :

1) (x-1)²=49
√(x-1)²=√49
x-1=7
x=8
S={8}


2) (2x+1)²=81
√(2x+1)²=√81
2x+1=9
2x=8
x=4
S={4}