<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>
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>