数学题解答?
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2000X×(0.004×2000X+1.2)=40121.2
2000X×(8X+1.2)=40121.2
16000X^2+2400x=40121.2
16000X^2+2400x-40121.2=0
aX^2+bx+c=0
一元二次方程用求根公式
: 根公式:x1=(-b+√(b^2-4ac))/2a,
x2=(-b-√(b^2-4ac))/2a
其中√(b^2-4ac)=√(2400^2-4x16000x(-40121.2))
= √ 2,573,516,800
=50729.8
x1=(-b+√(b^2-4ac))/2a
=(-2400+50729.8)/2x16000
=1.5103
x2=(-b-√(b^2-4ac))/2a
=(-2400-50729.8)/2x16000
=1.6603
2000X×(8X+1.2)=40121.2
16000X^2+2400x=40121.2
16000X^2+2400x-40121.2=0
aX^2+bx+c=0
一元二次方程用求根公式
: 根公式:x1=(-b+√(b^2-4ac))/2a,
x2=(-b-√(b^2-4ac))/2a
其中√(b^2-4ac)=√(2400^2-4x16000x(-40121.2))
= √ 2,573,516,800
=50729.8
x1=(-b+√(b^2-4ac))/2a
=(-2400+50729.8)/2x16000
=1.5103
x2=(-b-√(b^2-4ac))/2a
=(-2400-50729.8)/2x16000
=1.6603
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