两道方程求解
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两道方程求解
(6)Δ = 1²+4*2*6= 49
m1 = ( +1+√49 ) / (2*2)= 2
m2 = ( +1-√49 ) / (2*2) = -1.5
所以:
m1 =2
m2 =-1.5
(8)
Δ = 2²+4*2*1= 12
x1 = ( -2+√12 ) / (2*2)
=( -2+2√3) / (2*2)
=( -1+√3) / 2
x2 = ( -2-√12 ) / (2*2)
= ( -1-√3 ) / 2
因此:
x1=( -1+√3) / 2
x2 = ( -1-√3 ) / 2
(6)Δ = 1²+4*2*6= 49
m1 = ( +1+√49 ) / (2*2)= 2
m2 = ( +1-√49 ) / (2*2) = -1.5
所以:
m1 =2
m2 =-1.5
(8)
Δ = 2²+4*2*1= 12
x1 = ( -2+√12 ) / (2*2)
=( -2+2√3) / (2*2)
=( -1+√3) / 2
x2 = ( -2-√12 ) / (2*2)
= ( -1-√3 ) / 2
因此:
x1=( -1+√3) / 2
x2 = ( -1-√3 ) / 2
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