1、先化简,再求值:(a-根号3)(a+根号3)-a(a-6),其中a=根号5+2分之1谢谢了,2、已知x的平方-5x=4,求(2x-1)(x-1)-(x+1)的平方+1的值
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![1、先化简,再求值:(a-根号3)(a+根号3)-a(a-6),其中a=根号5+2分之1谢谢了,2、已知x的平方-5x=4,求(2x-1)(x-1)-(x+1)的平方+1的值](/uploads/image/z/440642-2-2.jpg?t=1%E3%80%81%E5%85%88%E5%8C%96%E7%AE%80%2C%E5%86%8D%E6%B1%82%E5%80%BC%EF%BC%9A%EF%BC%88a-%E6%A0%B9%E5%8F%B73%EF%BC%89%EF%BC%88a%2B%E6%A0%B9%E5%8F%B73%EF%BC%89-a%EF%BC%88a-6%EF%BC%89%2C%E5%85%B6%E4%B8%ADa%3D%E6%A0%B9%E5%8F%B75%2B2%E5%88%86%E4%B9%8B1%E8%B0%A2%E8%B0%A2%E4%BA%86%2C2%E3%80%81%E5%B7%B2%E7%9F%A5x%E7%9A%84%E5%B9%B3%E6%96%B9-5x%3D4%2C%E6%B1%82%EF%BC%882x-1%EF%BC%89%EF%BC%88x-1%EF%BC%89-%EF%BC%88x%2B1%29%E7%9A%84%E5%B9%B3%E6%96%B9%2B1%E7%9A%84%E5%80%BC)
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1、先化简,再求值:(a-根号3)(a+根号3)-a(a-6),其中a=根号5+2分之1谢谢了,2、已知x的平方-5x=4,求(2x-1)(x-1)-(x+1)的平方+1的值
1、先化简,再求值:(a-根号3)(a+根号3)-a(a-6),其中a=根号5+2分之1谢谢了,
2、已知x的平方-5x=4,求(2x-1)(x-1)-(x+1)的平方+1的值
1、先化简,再求值:(a-根号3)(a+根号3)-a(a-6),其中a=根号5+2分之1谢谢了,2、已知x的平方-5x=4,求(2x-1)(x-1)-(x+1)的平方+1的值
1.(a-√3)(a+√3)-a(a-6) =a^2-3-a^2+6a =6a-3 =6(√5+1/2)-3 =6√5+3-3 =6√5 2. x^2-5x=14 (2x-1)(x-1)-(x+1)^2+1 =2x^2-3x+1-x^2-2x-1+1 =x^2-5x+1 =14+1 =15
1)(a-√3)(a+√3)-a(a-6) =a-3-a+6a =6a-3 =6*(√5+1/2)-3 = 6√5+3-3 =6√5 2)(2x-1)(x-1)-(x+1)+1 =2x-3x+1-x-2x-1+1 =x-5x+1 =14+1 =15