已知x:y:z=2:3:5,求x+y+z/x-2y+3z的值解方程:x+1/x+2-1/x+7=x+2/x+3-1/x+6化简求值:1+x/x^2-1除以(x-2+3/x+2)*(x^2-2x+1)(其中x=1/2)已知3(x^2-1)^-1=x+1/2*(x^2-1)^-2,求X的值
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![已知x:y:z=2:3:5,求x+y+z/x-2y+3z的值解方程:x+1/x+2-1/x+7=x+2/x+3-1/x+6化简求值:1+x/x^2-1除以(x-2+3/x+2)*(x^2-2x+1)(其中x=1/2)已知3(x^2-1)^-1=x+1/2*(x^2-1)^-2,求X的值](/uploads/image/z/7113005-53-5.jpg?t=%E5%B7%B2%E7%9F%A5x%3Ay%3Az%3D2%3A3%3A5%2C%E6%B1%82x%2By%2Bz%2Fx-2y%2B3z%E7%9A%84%E5%80%BC%E8%A7%A3%E6%96%B9%E7%A8%8B%EF%BC%9Ax%2B1%2Fx%2B2-1%2Fx%2B7%3Dx%2B2%2Fx%2B3-1%2Fx%2B6%E5%8C%96%E7%AE%80%E6%B1%82%E5%80%BC%3A1%2Bx%2Fx%5E2-1%E9%99%A4%E4%BB%A5%28x-2%2B3%2Fx%2B2%29%2A%28x%5E2-2x%2B1%29%28%E5%85%B6%E4%B8%ADx%3D1%2F2%29%E5%B7%B2%E7%9F%A53%28x%5E2-1%29%5E-1%3Dx%2B1%2F2%2A%28x%5E2-1%29%5E-2%2C%E6%B1%82X%E7%9A%84%E5%80%BC)
已知x:y:z=2:3:5,求x+y+z/x-2y+3z的值解方程:x+1/x+2-1/x+7=x+2/x+3-1/x+6化简求值:1+x/x^2-1除以(x-2+3/x+2)*(x^2-2x+1)(其中x=1/2)已知3(x^2-1)^-1=x+1/2*(x^2-1)^-2,求X的值
已知x:y:z=2:3:5,求x+y+z/x-2y+3z的值
解方程:x+1/x+2-1/x+7=x+2/x+3-1/x+6
化简求值:
1+x/x^2-1除以(x-2+3/x+2)*(x^2-2x+1)(其中x=1/2)
已知3(x^2-1)^-1=x+1/2*(x^2-1)^-2,求X的值
已知x:y:z=2:3:5,求x+y+z/x-2y+3z的值解方程:x+1/x+2-1/x+7=x+2/x+3-1/x+6化简求值:1+x/x^2-1除以(x-2+3/x+2)*(x^2-2x+1)(其中x=1/2)已知3(x^2-1)^-1=x+1/2*(x^2-1)^-2,求X的值
已知x:y:z=2:3:5,求x+y+z/x-2y+3z的值
设x=2k y=3k,z=5k (k≠0)
( x+y+z)/(x-2y+3z)=(2k+3k+5k)/(2k-2×3k+3×5k)
=10k/11k=10/11
解方程:x+1/x+2-1/x+7=x+2/x+3-1/x+6
解 -1/(x+2)-1/(x+7)=-1/(x+3)-1/(x+6)
1/(x+2)+1/(x+7)=1/(x+3)+1/(x+6)
(2x+9)/(x+2)(x+7)=(2x+9)/(x+3)(x+6)
(2x+9)[1/(x+2)(x+7)-1/(x+3)(x+6)]=0 分母不能等于0
x=9/2
化简求值:
1+x/x^2-1除以(x-2+3/x+2)*(x^2-2x+1)(其中x=1/2)
(1+x)/(x+1)(x-1)÷?
已知3(x^2-1)^-1=x+1/2*(x^2-1)^-2,求X的值