K⁶ - 1 = (k³ - 1) (k³ + 1)
<span>а)(2х²-5х-7)(х-1)=0
2х</span>²-5х-7=0
<span>х-1=0
х=</span>
<span>х=-1
х=1
Ответ: х</span>₁=-1;х₂=1;х₃=
<span>б)x³-9x=0
х(х</span>²-9)=0
<span>х=0
х</span>²-9=0
<span>х=0
х=3
х=-3
Ответ:х</span>₁=-3;х₂=0;х₃=3.<span>
</span>
27-75=-48
8888888888888888888888888888888888888888888888888888
<span>(4a-b)-5a-3b=4a-b-5a-3b=4a-5a-b-3b=-a-4b
-(3x-0,4)+(0,4x-3)=-3x+0,4+0,4x-3=-2,6x-2,6
9-2(x+1)+x</span>=9-2x-2+x=7-x
12Y-(25-6Y+11)=18Y-36
12Y-25+6Y-11=18Y-36
12Y-18Y=25+11-36
-6Y=0
Y=0