Sagot :
x+y=20 (karesini alalım.)
x.y=30
x² +2xy+ y²=400
x² + y²+2.30=400
- x² + y²=340 olur.
- Başarılar...
Cevap:
Adım adım açıklama:
a²+b²=(a+b)²-2ab
a²+b²=20²-2.30=400-60=340
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