X( 36x^2 - 84x + 49) = 0
x= 0
36x^2 - 84x + 49 = 0
D = b^2 - 4ac = 7056 - 7056 = 0 - имеет один корень
x = - b/2a
x = 84/ 72 = 7/6 = 1 целая 1/6
Ответ: x1 = 0, x2 = 1целая 1/6.
<span>sin(x+y)-cosxsiny=sinxcosy+sinxcosy-cosxsiny=sinxcosy</span>
1
270:y-2=7*120:30
270:y-2=28
270:y=28+2
270:y=30
y=270:30
y=9
2
y:7+80=720:6
y:7+80=120
y:7=120-80
y:7=40
y=40*7
y=280