a b=7,a^2 b^2=29,求(a-b)^2的值
来源:学生作业帮助网 编辑:六六作业网 时间:2024/11/25 13:19:25
ab=7,a^2b^2=29,求(a-b)^2的值ab=7,a^2b^2=29,求(a-b)^2的值ab=7,a^2b^2=29,求(a-b)^2的值a^2+b^2=29,ab=7(a-b)^2+2a
a b=7,a^2 b^2=29,求(a-b)^2的值
a b=7,a^2 b^2=29,求(a-b)^2的值
a b=7,a^2 b^2=29,求(a-b)^2的值
a^2+ b^2=29,ab=7
(a -b)^2+2ab=29
(a -b)^2=15
a -b=√15,a -b=-√15)(舍去)
a -b=√15
(a-b)^2
=a^2+b^2-2ab
=29-14
=15