已知x是一元二次方程x^2+3x-1=0的实数根,那么代数式3x^2-6x分之x-3除以(x+2- x-2分之5)的值是

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2024-12-20 18:39:33
推荐回答(2个)
回答1:

X^+3X-1=0即x^+3x=1[(X-3)/(3X^-6X)]/[(X+2)-5/(X-2)]=[(X-3)/(3X^-6X)]/[(x�0�5-4)/(x-2)-5/(x-2)] 先将后面两项通分=[(X-3)/(3X^-6X)]/[(x�0�5-4-5)/(x-2)]算出后面的减法,=[(X-3)/(3X(x-2)]*[x-2)/(x+3)(x-3)]=1/3x�0�5+9x=1/[3(x^+3x)]=1/3

回答2:

答案是1.