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a8=(8+4) /(8+1)=12/9=4/3
2]
a1=2x-2
a2=x²
a3=4x-2
a2=[a1+a3]/2
x²=[2x-2+4x-2]/2 /*2
2x²=6x-4 /;2
x²-3x+2=0
Δ=9-8=1
x1=[3-1]/2=1
a1=2*1-2=0
a2=1²=1
a3=4*1-2=2
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x2=[3+1]/2=2
a1=2*2-2=2
a2=2²=4
a3=4*2-2=6
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