求大神解几道一元二次方程!x²+3x-0.31=0x²+3x-1.75=07x(x+5)+10+(9x-9)=0
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求大神解几道一元二次方程!x²+3x-0.31=0x²+3x-1.75=07x(x+5)+10+(9x-9)=0
求大神解几道一元二次方程!
x²+3x-0.31=0
x²+3x-1.75=0
7x(x+5)+10+(9x-9)=0
求大神解几道一元二次方程!x²+3x-0.31=0x²+3x-1.75=07x(x+5)+10+(9x-9)=0
x²+3x-0.31=0
(x+3.1)(x-0.1)=0
x=-3.1 x=0.1
(2)x²+3x-1.75=0
(x+3.5)(x-0.5)=0
x=-3.5 x=0.5
(3)7x(x+5)+10+(9x-9)=0
7x²+35x+10+9x-9=0
7x²+44x+1=0