6х-14=4х+7
6х-4х=7+14
2х=21
х=10,5
<span>x²</span><span>- 11х-42=0</span>
(7-17^2)^5*(7+17)^5=(<span>(7-17^2)*(7+17))^5=(-282*24)^5=6768^5</span>
-7х-1=0 и 2х+0.8=0
-7х=1 2х=-0.8
х=-1/7 x=-0.4
Sнижней=
![\sqrt{p*(p-a)(p-b)(p-c)}](https://tex.z-dn.net/?f=+%5Csqrt%7Bp%2A%28p-a%29%28p-b%29%28p-c%29%7D+)
p= (40+13+37)/2
p= 45
Sн=
![\sqrt{45*(45-37)(45-13)(45-40)}](https://tex.z-dn.net/?f=+%5Csqrt%7B45%2A%2845-37%29%2845-13%29%2845-40%29%7D+)
Sн=
![\sqrt{45*8*32*5}](https://tex.z-dn.net/?f=+%5Csqrt%7B45%2A8%2A32%2A5%7D+)
Sн= 240
Sб1= 50*40 = 2000
Sб2= 50*13= 650
Sб3= 50*37= 1850
=>
Sполной= 2Sн+Sб1+Sб2+Sб3
Sполной= 2*240+2000+650+1850= 4980