1) -1,5x^2=0 |:-1.5
x^2=0
x=0
2)x^2=4
x=2 x=-2
3) 2x^2=-7 |:2
x^2=-3.5
корней нет
4) x(x+9)=0
x=0 x=-9
5) 81x^2=64 | :81
x^2=64/81
x=8/9 x=-8/9
1) -1,5x^2=0 |:-1.5
x^2=0
x=0
2)x^2=4
x=2 x=-2
3) 2x^2=-7 |:2
x^2=-3.5
корней нет
4) x(x+9)=0
x=0 x=-9
5) 81x^2=64 | :81
x^2=64/81
x=8/9 x=-8/9