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X = √8; y = √2; z = √18
x + y − z = ?.


Răspuns :

x = ✓8 = ✓2³ = 2✓2

y=✓2

z=✓18 = √9•2 = ✓3²•2 = 3✓2

x + y - z = ✓8 + ✓2 - ✓18 = 2✓2 + ✓2 - 3✓2 =

= 3✓2 - 3✓2 = 0