1 способ
5x²-7x=0
D=49
x1=(7+7)/10=14/10=1.4
x2=(7-7)/10=0/10=0
2 способ
x(5x-7)=0
x=0
5x-7=0
x1=0
5x=7
x2=7/5=1.4
1 способ
5x²-7x=0
D=49
x1=(7+7)/10=14/10=1.4
x2=(7-7)/10=0/10=0
2 способ
5x²-7x=0
x(5x-7)=0
x=0
5x-7=0
x1=0
5x=7
x2=7/5=1.4