数学x^3-2x^2-x+2=0

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2025-04-03 01:54:54
推荐回答(6个)
回答1:

(x³-2x²)-(x-2)=0
x²(x-2)-(x-2)=0
(x-2)(x²-1)=0
(x-2)(x-1)(x+1)=0
则:x=2或x=1或x=-1

回答2:

x=2,x=1,x=-1

回答3:

(x²-1)*(x-2)=0
x=-1,x=1,x=2

回答4:

x^2(x-2)-(x-2)=0推出(x^2-1)(x-)=0即(x+1)(x-1)(x-2)=0则x=-1或1或2

回答5:

x³-2x²-x+2=0
x²(x-2)-(x-2)=0
(x²-1)(x-2)=0
(x-1)(x+1)(x-2)=0

解得x=1或x=-1或x=2

回答6:

采用分组分解法(x³-2x²)-(x-2)=0
x²(x-2)-(x-2)=0
(x-2)(x²-1)=0
(x-2)(x-1)(x+1)=0
则:x1=2或x2=1或x3=-1