(x-y)²+(x+y)²=(x²-2xy+y²)+(x²+2xy+y²)=2x²+2y²=2(x²+y²), ч.т.д.
<u>b:c</u>
при b=7569 и c=3 ⇒ 7569/3=2523
при b=345365 и c=5 ⇒ 345365/5=69073
√28 + √63= √7*4 + √9*7= 2√7+3√7=5<span>√7
</span>√99-√176=√11*9 - √11*16 = 3√11-4√11=-<span>√11
2</span>√50-5√200=√200 - √5000=√25*4*2 - √25*25*4*2=10√2 - 50√2= -40<span>√2
</span>5√92-√2300= √2300 - <span>√2300 = 0</span>
1 1\2 : ( 1\2 - 1\3 )=9
1\2 - 1\3 = 3\6 - 2\6 = 1\6
1 1\2 : 1\6 = 3\2 : 1\6 = 3\2 x 6\1 =9