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Exercitiul 5 punctele a,b,c
plss
Urgent!!


Exercitiul 5 Punctele Abc Plss Urgent class=

Răspuns :

a)2x²+5=7
2x²=7-5
2x²=2
x²=2:2
x²=1
x1=1
x2=-1
b)4x²-2=0
4x²=2
x²=2/4
x²=1/2
x1=-1/√2=-√2/2
x2=1/√2=√2/2
c)19x²+18=17
19x²=17-18
19x²=-1
x²=-1/19
∀x x²>0 =>x∈∅