5x-15x^2=0
5x×(1-3x)=0
x×(1-3x)=0
x=0
1-3x=0
x=1/3
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5x-15x^2=0
5x×(1-3x)=0
x×(1-3x)=0
x=0
1-3x=0
x=0
x=1/3
5x(1-3x)=0
x=0
1-3x=0
3x=1
x=1/3
ответ
0;1/3