Решение задания смотри на фотографии
<span>получается 91*92*93*94*95*96*97*98*99=6.2816*10^17</span>
1 1*√3 √3
```` = ````````` = ````````
√3 √3 *√3 3
√10 + 8 (√10 +8)(√10 +8) (√10+8)² 10+16√10 +64 -37-8√10
``````````` = ````````````````````````` = `````````` = ```````````````````` = ``````````
√10 - 8 (√10 -8)(√10+8) 10 - 64 - 54 27
1 5+√5 5+√5 5+√5
````` = ``````````````````` = ``````````` = ````````````
5-√5 (5- √5)(5+√5) 25 -5 20
X^2+y^2=50 и xy=7
X^2+y^2=50 и y=7/x
X^2+(7/x)^2=50 и y=7/x
X1=-7; x2=7; x3=-1; x4= 1
Y1=-1; y2=1; y3=-7; y4=7