Question

Se da x+y=5 x²-y²=15
Calculati valoarea nr:
a=(x-y)+(x-y)²+(x-y)³=

Answer 1

x=4; y=1, deoarece
4+1=5;     4²-1²=15
a=(4-1)+(4-1)²+(4-1)³ ⇔ a=3+(16-8+1)+(64-48+12-1) ⇔ a=3+9+27 ⇔ a=39
Raspuns: valoarea nr a=39