Во первых: х не равен -2/3
Второе
x-4=10+15x
14x=-14
x=-1
B×(7×a-14)
общим множитилем будет b
1) x-16<span><0
x</span><span><16
2) 28x+4</span><span>>0
28x</span><span>>-4
x</span><span>>-1/7
3) 31x+63</span><span>>36x+23
31x-36x</span><span>>23-63
-5x</span><span>>-40
x</span><span>>8</span>
1. а1=1 а2=-1 а3=2*(-1)-1= -3 а4= 2*(-3)+1=-6+1= -5
а5= -10+3= -7 а6=-14+5= -9
а6= -9
------------------
х5= -1,5 х6=0.75
x4+x7=2x1+3d+6d=2x1+9d?
x6-x5=d=0.75+1.5=2.25
x5=x1+4d=-1.5 x1+9=-1.5 x1=-9-1.5=-10.5
x4+x7=2x1+9d= -21+9*2.25= -21+20.25= -0.75
А) D=B'2-4AC
121-4*5*2=81
X1=11+9=2
10
X2=11-9=2
10 10