(x-1)²-7(x-1)+6=0小弟没分了,

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(x-1)²-7(x-1)+6=0小弟没分了,

把x-1看做一体
(x-1)²-7(x-1)+6=0
(x-1-1)(x-1-6)=0
(x-2)(x-7)=0
x=2或x=7