已知x,y为实数,且y=(根号下x2-9 + 根号下9-x2 + 7)/(x-3)求5x+6y的值要过程讲解,
人气:100 ℃ 时间:2019-10-19 07:15:31
解答
x^2-9>=0
9-x^2>=0
x-3不等于0
x=-3
y=-7/6
5x+6y=-22
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