9(x-1)²-4=0
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9(x-1)²-4=0
9(x-1)²-4=0
9(x-1)²-4=0
9(x-1)²-4=0
(x-1)²=4/9
x-1=2/3 或 x-1=-2/3
x=5/3 或 x=1/3
9(x-1)²-4=0
9(x-1)²=4
(x-1)²=4/9
x-1=±2/3
x=1±2/3,即x=5/3或x=1/3