(440/x-1)-(440/x)=4
2个回答

(440/x-1)-(440/x)=4

(110/x-1)-(110/x)=1 两边乘x(x-1)

110x-110(x-1)=x(x-1)

x²-x-110=0

(x-11)(x+10)=0

x1=11 x2=-10

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