已知x=2+根号3,y=2-根号3,求x的平方-xy-y的平方的值
人气:346 ℃ 时间:2020-01-27 20:18:42
解答
xy=(2+根号3)(2-根号3)=4-3=1
x+y=2
x-y=2根号3
x的平方-xy-y的平方
=(x-y)(x+y)-xy
=2×2根号3-1
=4根号3-1
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