解
x ³+y ³
=(x+y)(x²-xy+y²)
=(x+y)[(x+y)²-3xy]
=2[4-3xy]
=8-6xy
=26
xy=-3=a+4
a=-7
【数学辅导团】为您解答,
已知x+y=2,xy=a+4,x的3次方+y的三次方=26,求a的值.
已知x+y=2,xy=a+4,x的3次方+y的三次方=26,求a的值.
数学人气:536 ℃时间:2019-12-20 04:38:23
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