1) 1/6+1/18*3/4= 1/6+1/24=4/24+1/24=5/24
2) 203/48*6/7-13/9= 29/8-13/9= 261/72-104/72=157/72= 2 13/72
3) (16/24+15/24-22/24) *16/3= 9/24*16*/3= 9*16/24*3= 3*4/6*1= 12/6=2
4) 15 4/7-35/8*(50/35-34/35)= 15 4/7-35/8*16/35=15 4/7-35*16/8*35= 15 4/7-2= 13 4/7
D = ![(4a+1)^2 - 16a = 16a^2 + 8a +1 - 16 a^2 = 16a^2 - 8a +1 = (4a-1)^2](https://tex.z-dn.net/?f=%284a%2B1%29%5E2%20-%2016a%20%3D%2016a%5E2%20%2B%208a%20%2B1%20-%2016%20a%5E2%20%3D%2016a%5E2%20-%208a%20%2B1%20%3D%20%284a-1%29%5E2)
x1 = (4a +1 + (4a - 1))/2 = 0
x2 = (4a +1 - (4a - 1))/2 = (4a +1 - 4a + 1))/2 = 1.
при любом а
Y=22,
22=6x-14
6x=22-14
6x=8
3x=4
x=4/3
x=1 целая и 1/3
при х=1 целая 1/3 , у=22