Решить неполное квадратное уравнение
1) х^2-0,49 =0;
2) -0,8*х^2+3,2*x=0;
3)-7*x^2+2,8*x=0;
4) -4*x^2+25=0;
5) -0,6*x^2-9,6*x=0;
6)-0,1*x^2=0
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