已知x-1/x=3,则4-1/2x^+3/2x的值为( )已知x-1/x=3,则4-1/2x^+3/2x的值为( ) A.1 B.3/2 C.5/2 D.7/2
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![已知x-1/x=3,则4-1/2x^+3/2x的值为( )已知x-1/x=3,则4-1/2x^+3/2x的值为( ) A.1 B.3/2 C.5/2 D.7/2](/uploads/image/z/1263220-52-0.jpg?t=%E5%B7%B2%E7%9F%A5x-1%2Fx%3D3%2C%E5%88%994-1%EF%BC%8F2x%5E%2B3%2F2x%E7%9A%84%E5%80%BC%E4%B8%BA%EF%BC%88+%EF%BC%89%E5%B7%B2%E7%9F%A5x-1%2Fx%3D3%2C%E5%88%994-1%EF%BC%8F2x%5E%2B3%2F2x%E7%9A%84%E5%80%BC%E4%B8%BA%EF%BC%88++%EF%BC%89++++++++++++++++++++++++++++++A.1+++++B.3%2F2++++C.5%2F2++++D.7%2F2)
已知x-1/x=3,则4-1/2x^+3/2x的值为( )已知x-1/x=3,则4-1/2x^+3/2x的值为( ) A.1 B.3/2 C.5/2 D.7/2
已知x-1/x=3,则4-1/2x^+3/2x的值为( )
已知x-1/x=3,则4-1/2x^+3/2x的值为( ) A.1 B.3/2 C.5/2 D.7/2
已知x-1/x=3,则4-1/2x^+3/2x的值为( )已知x-1/x=3,则4-1/2x^+3/2x的值为( ) A.1 B.3/2 C.5/2 D.7/2
x-1/x=3
两边乘x
x平方-1=3x
-x平方+3x=-1
两边除以2
-1/2x平方+3/2x=-1/2
加上4
原式=4-1/2=7/2
选D