先化简,再求值:(a+根号3)(a-根号3)-a(a-6),a=1/2+根号1/2
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/16 22:09:45
![先化简,再求值:(a+根号3)(a-根号3)-a(a-6),a=1/2+根号1/2](/uploads/image/z/1344479-23-9.jpg?t=%E5%85%88%E5%8C%96%E7%AE%80%2C%E5%86%8D%E6%B1%82%E5%80%BC%3A%28a%2B%E6%A0%B9%E5%8F%B73%29%28a-%E6%A0%B9%E5%8F%B73%29-a%28a-6%29%2Ca%3D1%2F2%2B%E6%A0%B9%E5%8F%B71%2F2)
x){gu
:OzmlzڰJ#QقOkj$@NTeTOSl410Q,#4^*ltuY"D,QXdk$ف >b
先化简,再求值:(a+根号3)(a-根号3)-a(a-6),a=1/2+根号1/2
先化简,再求值:(a+根号3)(a-根号3)-a(a-6),a=1/2+根号1/2
先化简,再求值:(a+根号3)(a-根号3)-a(a-6),a=1/2+根号1/2
a=1/2+根号1/2=1/2+√2/2
(a+根号3)(a-根号3)-a(a-6)
=a^2-3-a^2+6a
=6a-2
=3-3√2-2
=1-3√2