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1)  x+4√7=(2+√7)^2
2)  2x-5\3=0,(3)
dau coroana


Răspuns :

1)x+4√7=4+4√7+7
x=11+4√7-4√7
x=11

2x-5/3=3/9
2x=1/3+5/3
2x=2
x=1