已知a是一元二次方程x^2+3x-2=0的实数根
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x^2+3x-2=0
带入a
a^2+3a-2=0
3a^2+9a=6
3a(a+3)=6
(3a的平方-6a)分之(a-3)除以(a+2-(a-2)分之5)
(a-3)/(3a^2-6a)/a+2-5/(a-2)
(a-3)/3a(a-2)/(a+2)-5/(a-2)
(a-3)/3a(a-2)/(a+2)(a-2)/(a-2)-5/(a-2)
(a-3)/3a(a-2)/(a+3)(a-3)/(a-2)
(a-3)/3a(a-2)*(a-2)/(a+3)(a-3)
=1/3a(a+3)
=1/6
带入a
a^2+3a-2=0
3a^2+9a=6
3a(a+3)=6
(3a的平方-6a)分之(a-3)除以(a+2-(a-2)分之5)
(a-3)/(3a^2-6a)/a+2-5/(a-2)
(a-3)/3a(a-2)/(a+2)-5/(a-2)
(a-3)/3a(a-2)/(a+2)(a-2)/(a-2)-5/(a-2)
(a-3)/3a(a-2)/(a+3)(a-3)/(a-2)
(a-3)/3a(a-2)*(a-2)/(a+3)(a-3)
=1/3a(a+3)
=1/6
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