<span>(х+3)(х-10) < (х-5)(х-2)
х²-10х+3х-30 </span><span>< х²-2х-5х+10
х²-7х-30 </span><span>< х²-7х+10
-30 </span><span>< 10</span>
а)12,67-18,87=-6,2 2)
б)4,15+2,15=6,3 5)
в)-(7/3+75/7)-(-129/14+13/6)=-(49/21+225/21)-(-387/42+91/42)=-274/21+296/42=
=-548/42+296/42=-252/42=-6 3)
г)-35/6+(21/6-25/6)=-35/6-4/6=-39/6=-6,5 4)
А) 2)
Б) 5)
В) 3)
Г) 4)
Выбираем лучшее решение!
2 (7+9x) = -6x+2
14+18x + 6x -2 =0
24x +12 =0
12(2x+1) =0
2x+1 =0
x= -1/2
4 (2-3x) = -7x+10
8 - 12x +7x -10 =0
-5x -2 =0
5x =-2
x = - 2/5
10+9 (-10-9x) = 8-x
10 - 90 - 81x -8 +x = 0
-88 -80x =0
80x = -88
x = - 1,1
-1-4 (-7+8x)= -2x-6
-1 +28 -32x + 2x +6 =0
33 -30x = 0
33 = 30x
x = 1,1
<span>6x - 8 (-7+9x) = -2x-8
</span>6x +56 -72x +2x +8 = 0
-64x + 64 =0
64x =64
x = 1