作业帮100分x^3(2x-5)(x+1)+(5x+2)(x-1)=0x^2/3+48/x^2=10(x/3-4/x)√x-1+√2x-3+√3x-5+√4x-5=5x-6
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100分x^3(2x-5)(x+1)+(5x+2)(x-1)=0x^2/3+48/x^2=10(x/3-4/x)√x-1+√2x-3+√3x-5+√4x-5=5x-6
100分
x^3(2x-5)(x+1)+(5x+2)(x-1)=0
x^2/3+48/x^2=10(x/3-4/x)
√x-1+√2x-3+√3x-5+√4x-5=5x-6
100分x^3(2x-5)(x+1)+(5x+2)(x-1)=0x^2/3+48/x^2=10(x/3-4/x)√x-1+√2x-3+√3x-5+√4x-5=5x-6
x/3-4/x=t代换可以了