1.先化简在求值 [2x÷(x-3 )-x÷(x+3)]*(x^-9)÷x,其中x=2的-3次方2.8÷(4x^-1)+(2x+3)÷(1-2x)=-13.在a取何值时,关于x的方程2÷(x-2)+(ax)÷(x^-4)=3÷(x+2)4.当K为何值时,能使关于x的方程(x+3)÷(x+2
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![1.先化简在求值 [2x÷(x-3 )-x÷(x+3)]*(x^-9)÷x,其中x=2的-3次方2.8÷(4x^-1)+(2x+3)÷(1-2x)=-13.在a取何值时,关于x的方程2÷(x-2)+(ax)÷(x^-4)=3÷(x+2)4.当K为何值时,能使关于x的方程(x+3)÷(x+2](/uploads/image/z/8609662-46-2.jpg?t=1.%E5%85%88%E5%8C%96%E7%AE%80%E5%9C%A8%E6%B1%82%E5%80%BC+%5B2x%C3%B7%EF%BC%88x-3+%EF%BC%89-x%C3%B7%28x%2B3%EF%BC%89%5D%2A%28x%5E-9%29%C3%B7x%2C%E5%85%B6%E4%B8%ADx%3D2%E7%9A%84-3%E6%AC%A1%E6%96%B92.8%C3%B7%EF%BC%884x%5E-1%EF%BC%89%2B%EF%BC%882x%2B3%EF%BC%89%C3%B7%EF%BC%881-2x%EF%BC%89%3D-13.%E5%9C%A8a%E5%8F%96%E4%BD%95%E5%80%BC%E6%97%B6%2C%E5%85%B3%E4%BA%8Ex%E7%9A%84%E6%96%B9%E7%A8%8B2%C3%B7%EF%BC%88x-2%EF%BC%89%2B%28ax%29%C3%B7%28x%5E-4%29%3D3%C3%B7%28x%2B2%294.%E5%BD%93K%E4%B8%BA%E4%BD%95%E5%80%BC%E6%97%B6%2C%E8%83%BD%E4%BD%BF%E5%85%B3%E4%BA%8Ex%E7%9A%84%E6%96%B9%E7%A8%8B%EF%BC%88x%2B3%EF%BC%89%C3%B7%EF%BC%88x%2B2)
1.先化简在求值 [2x÷(x-3 )-x÷(x+3)]*(x^-9)÷x,其中x=2的-3次方2.8÷(4x^-1)+(2x+3)÷(1-2x)=-13.在a取何值时,关于x的方程2÷(x-2)+(ax)÷(x^-4)=3÷(x+2)4.当K为何值时,能使关于x的方程(x+3)÷(x+2
1.先化简在求值 [2x÷(x-3 )-x÷(x+3)]*(x^-9)÷x,其中x=2的-3次方
2.8÷(4x^-1)+(2x+3)÷(1-2x)=-1
3.在a取何值时,关于x的方程2÷(x-2)+(ax)÷(x^-4)=3÷(x+2)
4.当K为何值时,能使关于x的方程(x+3)÷(x+2)=K÷(x+2)(x-1)+1的解为正数?
1.先化简在求值 [2x÷(x-3 )-x÷(x+3)]*(x^-9)÷x,其中x=2的-3次方2.8÷(4x^-1)+(2x+3)÷(1-2x)=-13.在a取何值时,关于x的方程2÷(x-2)+(ax)÷(x^-4)=3÷(x+2)4.当K为何值时,能使关于x的方程(x+3)÷(x+2
x^2=x*x x^3=x*x*x x^4=x*x*x*x ...
[2x÷(x-3 )-x÷(x+3)]*(x^2-9)÷x
=[2÷(x-3 )-1÷(x+3)]*(x^2-9)
=(2(x+3)-(x-3))/((x-3)(x+3))*x^(2-9)
=(x+9)/(x^2-9)*(x^2-9)
=x+9=1/8-9=71/8
2.8÷(4x^-1)+(2x+3)÷(1-2x)=-1
8÷(4x^2-1)+(2x+3)÷(1-2x)=-1
8÷((2x)^2-1)-(2x+3)÷(2x-1)=-1
8÷((2x-1)(2x+1))-(2x+3)÷(2x-1)=-1
(8-(2x+3)(2x+1)=-(2x-1)(2x+1)
-4x^2-8x+5=-4x^2+1
8x=4
x=1/2
4.当K为何值时,能使关于x的方程(x+3)÷(x+2)=K÷(x+2)(x-1)+1的解为正数?
(x+3)÷(x+2)=K÷(x+2)(x-1)+1
x+3=K÷(x-1)+x+2
1=K÷(x-1)
x-1=k
x=k+1
if k>-1 and k≠0
then x>0
看不清
很简单K<-1-根号5或K >-1+根号5