由题意得
x+y=41
xy=+8
x方+y方=(x+y)方-2xy=41方-2·8=1681-16=1665
x-y=(x-y)方的算术平方根=(x+y)方-4xy=1681-4·8=1681-32=1651哦
已知,x+y的平方根是+-41的平方根,xy的立方根是2,求x的平方+y的平方及x-y的值?
已知,x+y的平方根是+-41的平方根,xy的立方根是2,求x的平方+y的平方及x-y的值?
数学人气:542 ℃时间:2020-03-28 08:13:59
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