√2²+(x-4)²等于多少?+(x-4)²也在根号里,

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√2²+(x-4)²等于多少?+(x-4)²也在根号里,
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√2²+(x-4)²等于多少?+(x-4)²也在根号里,
√2²+(x-4)²等于多少?
+(x-4)²也在根号里,

√2²+(x-4)²等于多少?+(x-4)²也在根号里,
√2²+(x-4)²=√(x²-8x+20)