根号[(21x)²+(9x)²]=73.66 应该怎么算?
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根号[(21x)²+(9x)²]=73.66 应该怎么算?
根号[(21x)²+(9x)²]=73.66 应该怎么算?
根号[(21x)²+(9x)²]=73.66 应该怎么算?
441x²+81x²=73.66
522x²=73.66
x²=73.66/522
x≈±0.38