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Se consideră expresia ​

Se Consideră Expresia class=

Răspuns :

a. E(x)=x²-2x+1+x²+4x+4+18-2x²

E(x)=2x+23

b. E(√8)=4√2+23

E(√2)=2√2+23

E(√18)=6√2+23

4√2+23-(2√2+23)=6√2+23-(4√2+23)

4√2+23-2√2-23=6√2+23-4√2-23

2√2=2√2 Adevarat