The maximum recommended pulse rate R, when exercising, for a person who is x years of age is given by the equation ~$ R = 176 - 0.8x.$~ What is the age, in years, of a person whose maximum recommended pulse rate when exercising is 140 ?


40

45

50

55

60

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运动中最大心率和年龄之前的关系有如题函数表示。已知最大心率为140，求年龄？
解答：R=140=176-0.8x 解得x=45

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